SAEINT Members Profile 2026: Bio, Ages & Interesting Facts
SAEINT (세인트), also styled as SÆINT, is a four-member South Korean boy group preparing for its next chapter under Macaroni Media. The group consists of Seogyum, Yoonsang, Donggyu, and Beomsoo, all of whom previously promoted as members of L5ST.
As of September 2026, SAEINT is a pre-debut group, so many standard idol-profile details-such as an official fandom name, official positions, debut song, official colors, and full discography-have not yet been publicly confirmed. What is clear is that the four members are moving into a new group project after the conclusion of L5ST’s activities.
SAEINT’s first announced live project is SAEINT JAPAN LIVE -Don’t Stop–, scheduled in Tokyo from October 6 through October 30, 2026. The schedule includes regular performances, member-focused events, a Q&A fan meeting, a role-play fan meeting, and a free live event on October 18. The final listed performance is scheduled for October 30.
This article brings together the currently available information about SAEINT and its four members while separating confirmed information from details that have not yet been publicly established.
SAEINT Official Logo:
Official SNS:
Instagram: @seaint_official
X: @SAEINT_official
SAEINT Quick Facts
| Fact | Information |
|---|---|
| Group Name | SAEINT |
| Korean Name | 세인트 |
| Alternate Styling | SÆINT |
| Group Type | South Korean boy group |
| Members | Seogyum, Yoonsang, Donggyu, Beomsoo |
| Agency | Macaroni Media |
| Debut Date | Not yet officially announced |
| Current Status | Pre-debut |
| Origin | South Korea |
| Genre | Not officially confirmed |
| Fandom Name | Not publicly announced |
| Official Colors | Not publicly announced |
| Official Instagram | @seaint_official |
| Official X | @SAEINT_official |
| First Announced Japan Activities | October 6, 2026 |
| First Announced Project | SAEINT JAPAN LIVE -Don’t Stop- |
Table of Contents
Who Is SAEINT?
SAEINT is a newly announced four-member South Korean boy group made up of Seogyum, Yoonsang, Donggyu and Beomsoo.
The group is particularly notable because its members are not newcomers to the idol industry. All four have previous experience with L5ST, giving SAEINT a lineup with existing stage experience rather than a group composed entirely of first-time performers.
The four members’ careers also extend beyond L5ST. Yoonsang previously promoted with AWEEK, ASTIN and IB147, while Beomsoo previously belonged to IB147. Seogyum and Donggyu joined L5ST during its formation period in 2024.
L5ST debuted in September 2024 and later concluded its group activities in 2026. The transition from L5ST to SAEINT therefore represents a continuation of the members’ professional activities in a new four-member configuration.
At present, SAEINT should be described as a pre-debut group, rather than as an officially debuted K-pop act. No official debut date or debut single has been publicly confirmed.
SAEINT Group History
Formation and Connection to L5ST
The background of SAEINT is closely connected to L5ST.
L5ST debuted under Macaroni Media on September 5, 2024, with the digital single “Only One.” Seogyum, Yoonsang, Donggyu and Beomsoo were among the members who eventually formed the L5ST lineup.
The members therefore entered SAEINT with experience from an earlier group rather than starting their careers from zero.
L5ST later released “Free Fall” in December 2024 and participated in the survival program Re, although not every member took part in the program.
By 2026, L5ST’s group activities had come to an end. Reports and later statements from the group confirmed that the members would move forward separately rather than continue under the L5ST name.
From L5ST to SAEINT
The four members who now make up SAEINT are:
- Seogyum
- Yoonsang
- Donggyu
- Beomsoo
Their move into SAEINT gives the new group a direct connection to the members’ previous performance history.
Rather than describing SAEINT as a completely new beginning for inexperienced trainees, it is more accurate to view the group as a new project involving performers who already have experience with idol promotions, live stages and group activities.
SAEINT’s First Announced Activities
The first major public activity currently announced for SAEINT is a Japan performance series titled SAEINT JAPAN LIVE -Don’t Stop-.
The official Japanese ticketing listing gives the activity period as October 6–30, 2026, with performances at K-STAGE O! and J-STAGE O! in Tokyo.
The schedule contains a mixture of standard concerts and special fan-oriented events. It includes:
- Opening performance on October 6
- Donggyu-focused birthday performance on October 9
- Casual-clothes themed day on October 11
- Q&A fan meeting on October 13
- Beomsoo-focused event on October 15
- Yoonsang-focused event on October 21
- Seogyum-focused event on October 23
- Role-play fan meeting on October 25
- Gacha-themed event on October 27
- Halloween-themed event on October 29
- Final live performance on October 30
A free performance is also scheduled for October 18, 2026, at 12:00 JST.
This makes the Japan schedule an important part of SAEINT’s introduction to the public.
Agency and Management
SAEINT is identified as being under Macaroni Media in current group-profile information.
The Japanese event listing identifies Macaroni Music Entertainment as the organizer of the SAEINT Japan live project, with MOREDAY listed as a cooperating company.
These names should not automatically be treated as identical corporate entities. The currently available sources establish Macaroni Media as SAEINT’s agency association and Macaroni Music Entertainment as the organizer named for the Japanese event.
There is currently no reliable public information confirming a parent-company structure, detailed contract terms, contract duration or financial arrangements for SAEINT.
Has SAEINT officially debuted?
No official debut date has been publicly confirmed as of September 24, 2026.
The group is currently being presented as a pre-debut act, although its announced Japanese live schedule gives the members an immediate opportunity to perform for audiences.
SAEINT Members Profile
Seogyum Profile
Stage Name: Seogyum (서겸)
Birth Name: Kim Yeong Seok (김영석)
Date of Birth: September 3, 1999
Birthplace: Anyang, Gyeonggi-do, South Korea
Nationality: Korean
Height: 175 cm
Weight: 63 kg
Blood Type: O
MBTI: ESTP
Zodiac Sign: Virgo
Chinese Zodiac: Rabbit
Seogyum is the oldest member of SAEINT, having been born in 1999. Before joining SAEINT, he was a member of L5ST, where he worked alongside the other three members of the new group.
His professional background is somewhat different from the typical trainee-only profile. Available biographical information says that he has experience working as a film actor and that he had a strong background in athletics during his school years.
One particularly distinctive detail associated with Seogyum is his reported sprinting ability. His profile information states that he ranked first in Korea in sprinting during middle and high school.
He attended Pyeongtaek Seongdong Elementary School and Sinhan Middle School. He later attended Gyeonggi Physical Education High School before withdrawing and subsequently attended Dongil Technical High School.
Seogyum’s previous L5ST profile also confirms his birth date and MBTI, while current SAEINT profile information lists him as a Korean national.
His personality descriptions suggest a contrast between his appearance and his self-described character. Although he is reported to have an intimidating appearance, he has described himself as shy and kind-hearted.
He reportedly enjoys jogging, which fits naturally with his earlier athletic background.
Seogyum has also been associated with the nickname “Gyum,” which he would like fans to use. Another nickname listed for him is Seogwiyeomi.
His SAEINT role has not yet been officially defined. Therefore, labels such as main vocalist, rapper or dancer should not be assigned without an official source.
Family: Public profile information mentions an older sister, but detailed family information is otherwise limited.
Religion: Public profile information identifies him as Catholic.
Relationship status: There is no publicly confirmed relationship information available.
Net worth: The member’s exact net worth is not publicly available.
As SAEINT begins its live activities, Seogyum’s previous experience in L5ST and his athletic and performance background give him an established starting point within the new lineup.
Yoonsang Profile
Stage Name: Yoonsang (윤상)
Birth Name: Lee Yoon Sang (이윤상)
Date of Birth: March 6, 2000
Birthplace: Yongin, Gyeonggi-do, South Korea
Nationality: Korean
Height: 173 cm
Weight: 70 kg
Blood Type: B
MBTI: INTJ
Zodiac Sign: Pisces
Chinese Zodiac: Dragon
Yoonsang is the member of SAEINT with the most extensive publicly documented history across different idol groups.
Before SAEINT, he was a member of L5ST. His earlier career also includes IB147, AWEEK, and ASTIN. During his earlier activities, he used the stage names Logan and Mir.
His career therefore stretches back several years before the formation of SAEINT.
Yoonsang was a member of AWEEK, a group that debuted in 2019. Music-platform information also identifies him as a member of IB147, which released the singles “Overshock” and “Burning Moth” in 2023.
He subsequently became part of L5ST and appeared in the survival program Re as an L5ST member.
Yoonsang’s dance background is another important part of his profile. Available information states that he studied dance through the Future Education Center at Sejong University. He is also credited with having won several dance competition awards between 2016 and 2018.
His listed specialties include exercise and dancing.
Musically, Yoonsang has previously been associated with vocal and performance roles. However, SAEINT has not officially announced individual positions, so his exact position in the new group remains unconfirmed.
Yoonsang has cited Park Hyo-shin as a favorite singer and has expressed an interest in hip-hop. His listed favorite movie and webtoon genres include science fiction/fantasy, noir and action.
He is also reported to enjoy reading webtoons and eating foods such as yukhoe and steak.
One interesting part of his profile is his connection with ATEEZ. Available profile information lists San as one of his role models.
Yoonsang’s personal social accounts previously listed in profile databases are now reported as deactivated. Fans should therefore distinguish those accounts from SAEINT’s official group accounts.
Family: Public profile information mentions a younger brother and younger sister, but detailed family information is not publicly available.
Relationship status: There is no publicly confirmed relationship information available.
Net worth: The member’s exact net worth is not publicly available.
For SAEINT, Yoonsang brings several years of performance experience and familiarity with different group environments. His history also gives the new quartet one of its strongest links to the broader pre-SAEINT idol scene.
Donggyu Profile
Stage Name: Donggyu (동규)
Birth Name: Choi Dong Gyu (최동규)
Date of Birth: October 9, 2002
Birthplace: Daegu, Gyeongsangbuk-do, South Korea
Nationality: Korean
Height: 177 cm
Weight: 60 kg
Blood Type: AB
MBTI: INFP
Zodiac Sign: Libra
Chinese Zodiac: Horse
Donggyu is the third-oldest member of SAEINT and another former L5ST member.
He was born in Daegu and developed an interest in dance during his teenage years. Available profile information states that he began dancing at approximately 16 years old before continuing his education in practical dance.
His educational background includes Seoul Arts College, where he studied practical dance.
Donggyu’s profile is therefore strongly connected to performance. His dance background predates L5ST and is likely to be an important part of his activities with SAEINT, although the new group has not yet officially assigned member positions.
He has several nicknames, including Cha Donggyu, Natto, Gyudan and Ddonggyu.
His profile also describes him as the group’s “sexy member.” Because that description comes from profile material rather than an official SAEINT position announcement, it should be understood as a personality or image description rather than a formal group role.
Outside music and dance, Donggyu reportedly enjoys anime. Naruto and One Piece are among the titles associated with his interests.
He also appeared in a Global Earth YouTube video titled “Korean Teen Experience Mexican Greetings for the First Time.”
Donggyu was added to L5ST during the group’s formation period in 2024 and later participated in the group’s activities. His next chapter with SAEINT places him in a four-member lineup alongside three other L5ST alumni.
A particularly relevant detail is that Donggyu’s birthday falls during SAEINT’s first announced Japanese activity period. The October 9 Japan performance is specifically listed as a Donggyu birthday performance.
That event provides an early example of how SAEINT’s initial Japan schedule is being structured around individual members as well as group performances.
Family: Public profile information says that Donggyu has two younger brothers. Further family details are not publicly available.
Relationship status: There is no publicly confirmed relationship information available.
Net worth: The member’s exact net worth is not publicly available.
Official SAEINT position: Not officially announced.
Beomsoo Profile
Stage Name: Beomsoo (범수)
Birth Name: Park Beom Soo (박범수)
Date of Birth: May 1, 2003
Birthplace: Bucheon, Gyeonggi-do, South Korea
Nationality: Korean
Height: 180 cm
Weight: 54 kg
Blood Type: A
MBTI: INFJ
Zodiac Sign: Taurus
Chinese Zodiac: Goat
Known Role: Maknae
Beomsoo is the youngest member of SAEINT and has previous experience in both IB147 and L5ST.
Born in Bucheon in 2003, he entered the idol industry before SAEINT and gained experience through earlier group activities.
His previous group history makes him one of the members whose career can be traced through several projects. He was a member of IB147 before joining L5ST, and he later appeared on Re as part of L5ST.
Beomsoo is identified as the maknae, or youngest member, of SAEINT.
Dance is another important part of his background. His profile information states that he previously trained at Winners Dance School and that he trained for one year and seven months before debuting with his previous group.
He is also described as the group’s dance teacher, although SAEINT has not officially announced formal positions beyond the available member-profile information.
His listed favorite colors are light sky blue, white and light purple.
Beomsoo has several nicknames, including Beomgu, Bambeoksu, Beombaksu, Agjjang and Bomubomu. Another nickname is “Bomtriever,” a combination of Beomsoo and golden retriever.
He has also been described as a Christian in publicly available profile information.
Beomsoo’s previous work with IB147 is particularly relevant because IB147 released “Overshock” and “Burning Moth” in 2023. He and Yoonsang were both part of that earlier project.
His SAEINT Japan activities include a dedicated Beomsoo Day on October 15, giving him an individual spotlight during the group’s first announced promotional schedule.
Family: Public profile information mentions a younger brother. Detailed family information is not publicly available.
Relationship status: There is no publicly confirmed relationship information available.
Net worth: The member’s exact net worth is not publicly available.
As the youngest member, Beomsoo enters SAEINT with experience from two previous group projects and a documented dance background.
SAEINT Member Comparison
| Member | Birth Date | Birthplace | Previous Group Experience | MBTI | Height | SAEINT Position |
|---|---|---|---|---|---|---|
| Seogyum | September 3, 1999 | Anyang | L5ST | ESTP | 175 cm | Not announced |
| Yoonsang | March 6, 2000 | Yongin | AWEEK, ASTIN, IB147, L5ST | INTJ | 173 cm | Not announced |
| Donggyu | October 9, 2002 | Daegu | L5ST | INFP | 177 cm | Not announced |
| Beomsoo | May 1, 2003 | Bucheon | IB147, L5ST | INFJ | 180 cm | Maknae |
Former Group: L5ST
Understanding L5ST is important when looking at SAEINT’s formation.
L5ST debuted on September 5, 2024, under Macaroni Media with “Only One.” The group later released “Free Fall” and participated in the survival program Re.
The L5ST lineup changed during its active period. Seogyum, Donggyu, Yoonsang and Beomsoo were among the members who eventually promoted under the group.
L5ST’s activities concluded in 2026. The group’s final performance was held on July 5, 2026, and a later official statement confirmed that group activities under the L5ST name had ended.
This is significant for SAEINT because the four members are carrying forward existing performance experience into a new four-member team.
Earlier Group Experience
Yoonsang and AWEEK
Yoonsang previously performed as Logan in AWEEK.
AWEEK debuted in 2019 and developed a career involving both Korean and Japanese activities. Yoonsang’s involvement gave him early experience in group performance and overseas promotions.
Yoonsang and ASTIN
Yoonsang also previously used the name Mir during his time with ASTIN.
His history with ASTIN and AWEEK means that he had already experienced more than one group configuration before joining IB147 and L5ST.
IB147
IB147 was a pre-debut boy group associated with HnA Entertainment. The group released two singles in 2023:
- “Overshock” – February 14, 2023
- “Burning Moth” – September 16, 2023
Yoonsang and Beomsoo were both members.
Music-platform records identify IB147 as a Korean male group and preserve the group’s 2023 releases.
L5ST
Yoonsang, Beomsoo, Seogyum and Donggyu later became members of L5ST.
That shared history is the most direct connection between SAEINT’s current four members.
SAEINT Discography
Official Releases
No official SAEINT album, EP or single has been publicly confirmed as of September 24, 2026.
The group is currently in its pre-debut stage.
“Don’t Stop”
“Don’t Stop” is currently associated with SAEINT’s announced Japan live project, SAEINT JAPAN LIVE -Don’t Stop-.
It should not be described as an officially released SAEINT song or album unless an official music release is announced.
SAEINT Music Style and Artistic Direction
It is too early to define SAEINT’s definitive musical identity.
The group has not yet released an official debut album or title track, meaning claims about its established genre, lyrical themes, production style or long-term concept would be premature.
The available information does, however, point toward a performance-centered introduction. The group’s first announced project consists largely of live performances and fan-oriented events in Japan.
The members also collectively bring dance experience to the project. Yoonsang has a documented dance background, Donggyu studied practical dance, and Beomsoo has experience as a dance trainee and teacher.
What remains unknown is how these performance skills will be translated into SAEINT’s eventual recorded music.
SAEINT Awards and Achievements
Because SAEINT has not officially debuted, it does not yet have a verified group-level award history.
| Year | Award / Achievement | Work | Result |
|---|---|---|---|
| 2026 | First announced Japan live project | Don’t Stop | Scheduled |
| 2026 | Free live event | SAEINT Japan Live | Scheduled |
| 2026 | Member-focused live events | SAEINT Japan Live | Scheduled |
The members’ previous achievements should be kept separate from SAEINT’s own record.
For example, Yoonsang has a documented history of dance competition awards, while IB147 and L5ST have their own release and performance histories. Those achievements belong to earlier stages of the members’ careers.
SAEINT Tours and Concerts
SAEINT JAPAN LIVE -Don’t Stop-
The group’s first announced major live project is scheduled for October 6–30, 2026, in Tokyo.
The official event listing includes performances at:
- K-STAGE O!
- J-STAGE O!
The schedule includes both paid and free events.
The listed standard ticket price is ¥4,500 in advance and ¥5,000 on the day, while the October 18 Free LIVE is listed at no admission charge.
The final listed performance is scheduled for October 30 at J-STAGE O!.
Because these performances have not yet occurred as of September 24, 2026, they should be described as scheduled, not completed achievements.
Brand Endorsements and Ambassadorships
No verified SAEINT group endorsement or official ambassador appointment has been identified in the currently available reliable sources.
Individual members may have previous appearances or activities, but a campaign appearance should not automatically be described as an endorsement or ambassador role.
Current verified SAEINT endorsement status: Not publicly available.
SAEINT Social Media Presence
| Platform | Account | Status |
|---|---|---|
| @seaint_official | Official group account listed | |
| X | @SAEINT_official | Official group account listed |
| TikTok | Not publicly confirmed | Not confirmed |
| YouTube | Not publicly confirmed | Not confirmed |
| Weverse | Not publicly confirmed | Not confirmed |
| Official Website | Not publicly confirmed | Not confirmed |
Several members’ older personal Instagram or TikTok accounts are listed as deactivated in profile databases. Those should not be confused with SAEINT’s active group accounts.
Revenue Sources
Because SAEINT has not officially debuted, there is no reliable public information about group income.
Potential revenue categories for an idol group of this type can include:
- Live performances
- Ticket sales
- Fan meetings
- Merchandise
- Music sales
- Streaming
- Digital releases
- Brand partnerships
- Advertising
- Individual entertainment work
However, these are potential revenue categories rather than confirmed SAEINT earnings.
The group’s upcoming Japan live project establishes ticketed performances as one publicly documented commercial activity, but no reliable figures for member earnings or group revenue have been published.
SAEINT Fandom Name and Official Color
As of September 24, 2026, SAEINT does not have a publicly confirmed official fandom name.
The group also does not have a publicly confirmed official color.
Readers should not confuse the fandom name LOV3ST, associated with L5ST, with SAEINT.
Until SAEINT or its agency officially announces a fandom identity, the appropriate description is:
SAEINT fandom name: Not publicly announced.
Interesting Facts About SAEINT
- SAEINT is currently a four-member pre-debut boy group.
- The group’s Korean name is 세인트.
- SAEINT is also styled as SÆINT in available group-profile information.
- The current members are Seogyum, Yoonsang, Donggyu and Beomsoo.
- All four members previously promoted with L5ST.
- SAEINT is associated with Macaroni Media.
- The group has not yet announced an official debut date.
- No official SAEINT fandom name has been announced.
- No official SAEINT color has been announced.
- Seogyum was born on September 3, 1999.
- Yoonsang was born on March 6, 2000.
- Donggyu was born on October 9, 2002.
- Beomsoo was born on May 1, 2003.
- Yoonsang previously performed under the names Logan and Mir.
- Yoonsang has previous group experience with AWEEK, ASTIN and IB147.
- Beomsoo previously promoted with IB147 before joining L5ST.
- Donggyu studied practical dance.
- Beomsoo is identified as SAEINT’s youngest member.
- SAEINT’s first announced major live project is in Japan.
- The scheduled Japan project runs from October 6 through October 30, 2026.
Frequently Asked Questions
Who are the members of SAEINT?
The four members of SAEINT are Seogyum, Yoonsang, Donggyu and Beomsoo.
What is SAEINT?
SAEINT is a South Korean four-member boy group associated with Macaroni Media. As of September 2026, the group is in its pre-debut stage.
When will SAEINT debut?
An official SAEINT debut date has not yet been publicly announced.
How many members does SAEINT have?
SAEINT currently has four members: Seogyum, Yoonsang, Donggyu and Beomsoo.
Who is the oldest member of SAEINT?
Seogyum, born on September 3, 1999, is the oldest member.
Who is the youngest member of SAEINT?
Beomsoo, born on May 1, 2003, is the youngest member and is identified as the maknae.
Who is the leader of SAEINT?
A leader has not yet been officially announced for SAEINT.
What agency manages SAEINT?
SAEINT is associated with Macaroni Media.
What is SAEINT’s fandom name?
SAEINT’s official fandom name has not yet been publicly announced.
What is SAEINT’s official color?
An official SAEINT color has not yet been publicly confirmed.
Are SAEINT members former L5ST members?
Yes. Seogyum, Yoonsang, Donggyu and Beomsoo all previously promoted as members of L5ST.
Was Yoonsang in other K-pop groups?
Yes. Yoonsang has previous experience with AWEEK, ASTIN and IB147, in addition to L5ST.
Was Beomsoo a member of IB147?
Yes. Beomsoo was previously a member of IB147 before joining L5ST and later SAEINT.
Does SAEINT have any released songs?
No official SAEINT music release has been publicly confirmed as of September 24, 2026.
What is SAEINT’s first major scheduled activity?
The group’s first announced major activity is SAEINT JAPAN LIVE -Don’t Stop-, scheduled for October 6–30, 2026.
Where will SAEINT perform in Japan?
The announced performances are scheduled at K-STAGE O! and J-STAGE O! in Tokyo.
Will SAEINT hold a free concert?
Yes. A free SAEINT live event is scheduled for October 18, 2026, at 12:00 JST.
Does SAEINT have official social media?
The group’s listed official social accounts are Instagram @seaint_official and X @SAEINT_official.
What is Seogyum’s real name?
Seogyum’s birth name is listed as Kim Yeong Seok (김영석).
What is Beomsoo’s real name?
Beomsoo’s birth name is listed as Park Beom Soo (박범수).
Conclusion
SAEINT enters the K-pop scene with an unusual advantage for a pre-debut group: all four members already have professional idol experience.
Seogyum, Yoonsang, Donggyu and Beomsoo previously worked together through L5ST, while Yoonsang and Beomsoo also have earlier experience with IB147 and Yoonsang has a longer history involving AWEEK and ASTIN.
The group is still at an early stage, so important details such as its official debut date, first song, fandom name, colors and formal member positions remain unconfirmed.
For now, SAEINT’s most clearly documented next step is its Japanese live project running from October 6 to October 30, 2026. Those performances will introduce the four-member lineup to audiences while the group establishes its identity beyond its members’ previous activities.
More Info About Kpopbio
