UX1 Members Profile 2026: Age, Bio, Height, Birthday, Career, Facts & Net Worth
In a K-pop landscape increasingly defined by nostalgia and reinvention, UX1 (유엑스원) represents one of the most exciting reunions of the decade. Formed by three beloved members of the legendary second-generation boy group U-KISS—Kevin Woo, Yeo Hoon-min (Hoon), and Lee Ki-seop (Kiseop)—UX1 is a special unit that bridges the golden era of K-pop with fresh, contemporary sounds.
Officially announced on November 1, 2025, UX1 immediately captured the attention of fans worldwide. The group’s name, pronounced “You-X-One,” symbolizes a new beginning—a fresh chapter for artists who have already left an indelible mark on the industry. Their debut digital single “HALO,” released on November 26, 2025, marked their official entry into the modern K-pop scene.
What makes UX1 particularly significant is the calibre of its members. Between them, they represent over 50 years of combined industry experience, countless hit songs, global tours, and individual accomplishments in musical theatre, television hosting, and songwriting. Unlike typical rookie groups, UX1 arrived with an already-established fanbase and a legacy that spans nearly two decades.
UX1 Quick Facts
Table of Contents
Who Is UX1?
UX1 is a three-member South Korean boy group formed as a special unit by former and current U-KISS members. The group represents the fourth official unit of U-KISS, following previous sub-units and special projects.
The trio—Kevin Woo, Yeo Hoon-min (Hoon), and Lee Ki-seop (Kiseop)—were all integral members of U-KISS during its most successful periods. Kevin was the group’s main vocalist and face, Hoon joined in 2011 and became a key performer, and Kiseop served as main dancer and vocalist. Their decision to reunite as UX1 was driven by a shared desire to create new music together and reconnect with fans who had supported them throughout their careers.
Unlike traditional K-pop groups that debut with years of trainee experience, UX1 debuted with seasoned professionals who have already proven themselves on some of the industry’s biggest stages. This unique positioning allows UX1 to deliver polished performances and high-quality music from day one, while also carrying the emotional weight of a reunion that fans had long hoped for.
The group’s activities have focused heavily on Japan, where they held their first concert series, “First Winter Story,” in December 2025. This strategic focus reflects both the members’ strong Japanese fanbase and their desire to honour the market that embraced U-KISS so warmly throughout their career.
Group History
Formation and Pre-Debut
The story of UX1 begins with the enduring friendship and professional chemistry between Kevin, Hoon, and Kiseop. All three members shared the stage as part of U-KISS during various periods. Kevin was an original member from the group’s debut in 2008 until his departure in 2017. Hoon joined U-KISS in 2011 and remained with the group. Kiseop was also an original member, debuting with U-KISS in 2008 and continuing with the group through various lineup changes.
The idea of reuniting as a unit had been discussed among the members for some time. On November 1, 2025, the trio made their reunion official. They opened official social media accounts, unveiled a sleek new group logo, and released an introductory video greeting fans. In the video, they stated: “We are coming to meet our fans with our new team name, UX1. Please look forward to us”.
The announcement generated significant excitement across the K-pop community. Fans of U-KISS—known as KISSme—were particularly emotional, as the reunion brought together members who had been part of the group’s most iconic eras. The fandom name for UX1 was confirmed as KISSme, maintaining the connection to U-KISS’s beloved fanbase.
Official Debut
UX1 officially debuted on November 26, 2025, with the release of their first digital single, “HALO”. The song was produced by Kevin D, a renowned producer who had previously worked on Oricon chart-topping tracks for artists including JO1, INI, NCT 127’s Yuta, Kim Jaejoong, and Kep1er. Member Kiseop also participated in the song’s creation, marking the group’s commitment to artistic involvement from the very beginning.
“HALO” was well-received, showcasing the members’ mature vocals and the polished production quality expected from seasoned artists. The song’s dance-pop sound, combined with emotional lyrics, established UX1’s musical identity as a group that balances contemporary trends with the emotional depth of second-generation K-pop.
Breakthrough Success
Following their debut, UX1 quickly moved to connect with fans through live performances. The group announced their first concert series, “First Winter Story,” scheduled for December 2025 in Japan. The concerts took place at Dream Square in Osaka on December 20–21, 2025, and at TIAT Sky Hall in Tokyo on December 24–25, 2025. These Christmas-themed concerts allowed UX1 to spend the holiday season with their fans, creating meaningful memories and solidifying their presence in the Japanese market.
The group also released a special digital single, “Winterland,” on December 4, 2025, further establishing their discography and giving fans additional music to enjoy during the holiday season.
Recent Activities (2026)
In 2026, UX1 has continued to build momentum. Kevin has been announced as a judge and mentor for the upcoming season of Produce 101 Japan, demonstrating his continued influence in the industry. The members have also participated in various talk and live events, including the “2026 UX1 Talk&LIVE RUN 2U” in Osaka.
The group maintains an active social media presence, regularly updating fans through their official channels. Their strategy of focusing on the Japanese market while maintaining global digital presence has proven effective, allowing them to leverage their existing fanbase while attracting new listeners.
Major Career Milestones
| Year | Milestone |
|---|---|
| 2025 | November 1: UX1 formation announced |
| 2025 | November 26: Debut with “HALO” |
| 2025 | December 4: Release of “Winterland” |
| 2025 | December 20-25: “First Winter Story” concerts in Japan |
| 2026 | Active promotions, talk events, and new projects |
Agency and Management
UX1 is managed under UX1 Official, with members also represented by various agencies. Kevin is signed with FC ENM in South Korea, Japan Music Entertainment in Japan, and UTA (United Talent Agency) globally. This multi-agency structure allows the members to pursue individual activities while also promoting together as UX1.
The group’s music is distributed through Genie Music and Stone Music Entertainment. Their strategic focus on Japan is supported by strong partnerships with Japanese event organisers and promoters, including FC LIVE.
Complete Member Profiles
Kevin Woo (케빈)
Profile
Group Role
| Information | Details |
|---|---|
| Position | Main Vocalist, Lead Dancer, Face of the Group |
| Representative Emoji | Not officially announced |
| Training Period | Approximately 4 years |
Early Life and Education
Kevin Woo was born on November 25, 1991, in Danville, California, where he was raised in the San Francisco Bay Area. He grew up in a family with a strong artistic background: his mother was a fashion model in South Korea, and his paternal uncle, Emmanuel Woo, was an actor and classical opera singer in Germany. He has an older sister named Deanna Woo.
Kevin attended Monte Vista High School in California, where he was an active member of the school choir. His musical talents were evident from a young age. During a trip to South Korea, he auditioned for XING Entertainment and was accepted at the age of 15. He then moved to South Korea with his mother to pursue a career in music. He later graduated from Kyungdong High School in South Korea.
Career Journey
Pre-debut and XING (2006)
Kevin’s professional career began on December 14, 2006, when he debuted as a member of the group XING with the single album In Your Hands. However, his time with XING was short-lived. In April 2008, he left the group and filed a lawsuit against XING Entertainment for breach of contract. He won the lawsuit on March 21, 2010.
U-KISS Debut and Rise to Fame (2008–2017)
On August 28, 2008, Kevin debuted as a member of U-KISS through the mini album New Generation. As the group’s main vocalist and lead dancer, he became one of its most recognisable members. U-KISS quickly gained popularity with hits like “Man Man Ha Ni” and “Neverland,” establishing themselves as one of the leading second-generation K-pop groups.
During his time with U-KISS, Kevin also pursued numerous individual activities:
- 2009: Became an MC for Arirang TV’s radio show Pops in Seoul
- 2009: Released the single “Finally” with Alexander
- 2010: Appeared in the drama I Am Legend with fellow U-KISS members
- 2010: Became MC for Arirang TV’s The M-Wave
- 2011: Took on the lead role in the musical On Air Live
- 2011: Collaborated with Japanese singer JAMOSA on “Together”
- 2011: Became MC for Mnet’s US M! Countdown
- 2013: Joined the U-KISS sub-unit uBEAT with Eli and others
Kevin departed from U-KISS in 2017.
Solo Career and Hosting (2017–2025)
Following his departure from U-KISS, Kevin continued his career as a solo artist and television host. He became widely known as the host of After School Club, a popular K-pop talk show. He also ventured into musical theatre and continued releasing solo music.
In 2025, Kevin gained international attention for providing the singing voice for Mystery Saja, the lead vocalist of Saja Boys, in the hit animated film KPop Demon Hunters.
UX1 (2025–Present)
On November 1, 2025, Kevin reunited with Hoon and Kiseop to form UX1. The group debuted on November 26, 2025, with “HALO”. In 2026, Kevin was announced as a judge and mentor for Produce 101 Japan.
Family Background
Kevin comes from an artistic family. His mother was a fashion model in South Korea, and his paternal uncle, Emmanuel Woo, was an actor and classical opera singer in Germany. He has one older sister, Deanna Woo. Further details about his family are not publicly available.
Relationship Status
As of 2026, Kevin has not publicly confirmed any romantic relationship. He keeps his personal life private.
Net Worth
Kevin’s exact net worth is not publicly disclosed. As a veteran artist with nearly 20 years in the industry, multiple income streams from music, hosting, musical theatre, and endorsements contribute to his earnings. However, no verified estimate is available.
Social Media Profiles
| Platform | Handle |
|---|---|
| @kevinwoo91 (personal) | |
| X (Twitter) | @kevinwoo91 |
| TikTok | Not publicly available |
| YouTube | Kevin Woo (official channel) |
| Weverse | Not publicly available |
Interesting Facts About Kevin
- He was born and raised in Danville, California, USA.
- He is a Korean-American citizen.
- He was a member of XING before U-KISS.
- He served as the main vocalist of U-KISS.
- He hosted After School Club for many years.
- He provided the singing voice for Mystery Saja in KPop Demon Hunters.
- He is a judge for Produce 101 Japan.
- His MBTI type is ESFP.
- He has an older sister named Deanna.
- He speaks both Korean and English fluently.
Yeo Hoon-min (훈 / Hoon)
Profile
Group Role
| Information | Details |
|---|---|
| Position | Vocalist, Dancer |
| Representative Emoji | Not officially announced |
| Training Period | Information not publicly available |
Early Life and Education
Yeo Hoon-min was born on August 16, 1991, in Namyangju, Gyeonggi-do, South Korea. Details about his early life, family, and education are not widely publicised. He maintains a private stance regarding his personal background.
Career Journey
Joining U-KISS (2011)
Hoon joined U-KISS in 2011, following the departures of Alexander and Kibum from the original lineup. He was recruited alongside AJ to strengthen the group’s vocal and performance capabilities. Hoon quickly became an integral part of U-KISS, contributing to the group’s continued success during its most active years.
U-KISS Activities
During his time with U-KISS, Hoon participated in numerous album releases, tours, and promotional activities. He was known for his stable vocals, charismatic stage presence, and strong dance skills. The group maintained a particularly strong following in Japan, where they released multiple Japanese singles and held extensive tours.
Departure from NH Media
Hoon departed from NH Media in August 2021. Following his departure, he pursued individual activities while maintaining connections with his former group members.
UX1 (2025–Present)
On November 1, 2025, Hoon reunited with Kevin and Kiseop to form UX1. The group’s formation marked a new chapter in Hoon’s career, allowing him to return to the stage alongside members he had previously worked with. The group debuted on November 26, 2025, with “HALO”.
Hoon has been actively involved in UX1’s promotional activities, including their “First Winter Story” concerts in Japan and the “2026 UX1 Talk&LIVE RUN 2U” events.
Family Background
Information about Hoon’s family is not publicly available. He has maintained privacy regarding his personal life.
Relationship Status
As of 2026, Hoon has not publicly confirmed any romantic relationship.
Net Worth
Hoon’s exact net worth is not publicly disclosed. As a veteran K-pop artist with over a decade in the industry, his income derives from music sales, concerts, and various activities. No verified estimate is available.
Social Media Profiles
| Platform | Handle |
|---|---|
| @yeohoonmin (personal) | |
| X (Twitter) | Not publicly available |
| TikTok | Not publicly available |
| YouTube | Not publicly available |
| Weverse | Not publicly available |
Interesting Facts About Hoon
- His real name is Yeo Hoon-min.
- He was born in Namyangju, Gyeonggi-do, South Korea.
- He joined U-KISS in 2011.
- He departed from NH Media in August 2021.
- His MBTI type is ISFP.
- His blood type is B.
- He is 180 cm tall.
- He reunited with Kevin and Kiseop to form UX1 in 2025.
- He participated in UX1’s Christmas concerts in Japan.
- He maintains a private personal life.
Lee Ki-seop (기섭 / Kiseop)
Profile
Group Role
| Information | Details |
|---|---|
| Position | Main Dancer, Sub-Vocalist |
| Representative Emoji | Not officially announced |
| Training Period | Information not publicly available |
Early Life and Education
Lee Ki-seop was born on January 17, 1991, in Seongnam, Gyeonggi Province, South Korea. He grew up with his parents and an older sister. Details about his education are not publicly available. He has maintained a private stance regarding his upbringing.
His hobbies include photography, acting, vocal mimicry, and Taekwondo.
Career Journey
U-KISS Debut and Rise (2008–2019)
Kiseop debuted as an original member of U-KISS on August 28, 2008, through the mini album New Generation. As the group’s main dancer and sub-vocalist, he was known for his impressive dance skills and visual appeal. U-KISS quickly rose to prominence with hits like “Man Man Ha Ni” and “Neverland”.
During his time with U-KISS, Kiseop participated in numerous albums, tours, and variety show appearances. He was particularly popular in Japan, where U-KISS maintained a strong and loyal fanbase.
Departure and Return
Kiseop departed from U-KISS in 2019 but later rejoined the group in 2022. His return was welcomed by fans, and he continued to promote with the group.
UX1 (2025–Present)
On November 1, 2025, Kiseop reunited with Kevin and Hoon to form UX1. The group’s formation allowed Kiseop to continue his career alongside members he had known for years. He participated in the creation of UX1’s debut single “HALO,” co-writing the song with producer Kevin D. This involvement demonstrated his growth as an artist and his commitment to creative expression.
Kiseop has been actively involved in UX1’s promotional activities, including their “First Winter Story” concerts in Japan and the “2026 UX1 Talk&LIVE RUN 2U” events.
Family Background
Kiseop grew up with his parents and an older sister. Further details about his family are not publicly available.
Relationship Status
As of 2026, Kiseop has not publicly confirmed any romantic relationship.
Net Worth
Kiseop’s exact net worth is not publicly disclosed. As a veteran K-pop artist with over 15 years in the industry, his income derives from music sales, concerts, and various activities. No verified estimate is available.
Social Media Profiles
| Platform | Handle |
|---|---|
| @kiseop0117 (personal) | |
| X (Twitter) | Not publicly available |
| TikTok | Not publicly available |
| YouTube | Not publicly available |
| Weverse | Not publicly available |
Interesting Facts About Kiseop
- His real name is Lee Ki-seop.
- He was born in Seongnam, Gyeonggi Province, South Korea.
- He debuted with U-KISS in 2008.
- He is the main dancer of U-KISS and UX1.
- He departed from U-KISS in 2019 and rejoined in 2022.
- He co-wrote UX1’s debut single “HALO”.
- His hobbies include photography, acting, vocal mimicry, and Taekwondo.
- His blood type is A.
- He is 181 cm tall.
- He has an older sister.
Former Members
UX1 was formed specifically as a trio and has no former members. The group’s lineup has remained consistent since its formation on November 1, 2025.
Discography
Digital Singles
| Title | Release Date | Type | Notes |
|---|---|---|---|
| HALO | November 26, 2025 | Debut Digital Single | Co-written by Kiseop and Kevin D |
| Winterland | December 4, 2025 | Special Digital Single | Holiday release |
Notable Songs
Upcoming Releases
As of 2026, UX1 has not announced any new releases beyond their two digital singles. Fans eagerly await further music from the group.
Music Style and Influence
UX1’s musical identity blends ballad, dance, and pop genres. Their debut single “HALO” features a dance-pop sound with emotional depth, characteristic of second-generation K-pop while incorporating modern production elements.
The group’s music is influenced by:
- Second-generation K-pop: The members’ extensive experience in the industry shapes their musical approach
- Japanese pop: Their focus on the Japanese market influences their sound and promotional style
- R&B and ballads: Kevin’s vocal training and musical theatre background contribute to the group’s vocal quality
As songwriters and producers, the members—particularly Kevin and Kiseop—are actively involved in the creative process, ensuring that UX1’s music reflects their artistic vision.
Awards and Achievements
As UX1 is a newly formed group that debuted in late 2025, they have not yet received any major awards as a group. However, the members have accumulated numerous achievements throughout their individual careers:
Individual Achievements
| Member | Achievement |
|---|---|
| Kevin | Former main vocalist of U-KISS; Host of After School Club; Judge for Produce 101 Japan |
| Hoon | Member of U-KISS for over a decade; Successful concert tours in Japan |
| Kiseop | Main dancer of U-KISS; Songwriting credit on “HALO” |
Group Achievements (U-KISS)
As UX1 continues to grow, the group is expected to receive recognition in the coming years.
Tours and Concerts
Future tours and concerts are expected as the group continues to promote.
Brand Endorsements and Ambassadorships
As of 2026, UX1 has no publicly confirmed brand endorsements or ambassadorships. Given the members’ individual profiles and the group’s recent debut, such partnerships may be announced in the future.
Social Media Presence
| Platform | Official Account | Status |
|---|---|---|
| @ux1_official | Active | |
| X (Twitter) | @UX1_official | Active |
| TikTok | @ux1_official | Active |
| YouTube | UX1 Official | Active |
| Weverse | Not publicly available | – |
| Official Website | Not publicly available | – |
The group’s official social media accounts were launched on November 1, 2025.
Net Worth and Revenue Sources
As a newly formed group, UX1’s collective net worth is not publicly disclosed. However, the members derive income from multiple sources:
As UX1 continues to build its career, these revenue streams are expected to grow.
20 Interesting Facts About UX1 Members
- UX1 is the fourth official unit of U-KISS.
- The group was formed on November 1, 2025.
- UX1 debuted on November 26, 2025, with “HALO”.
- The group’s name is pronounced “You-X-One”.
- The official fandom name is KISSme.
- All three members were originally part of U-KISS.
- Kevin is a Korean-American born in California.
- Kevin was a member of XING before U-KISS.
- Kevin hosted After School Club.
- Kevin is a judge for Produce 101 Japan.
- Hoon joined U-KISS in 2011.
- Hoon departed from NH Media in August 2021.
- Kiseop co-wrote UX1’s debut single “HALO”.
- Kiseop debuted with U-KISS in 2008.
- Kiseop departed from U-KISS in 2019 and rejoined in 2022.
- Kevin’s MBTI type is ESFP.
- Hoon’s MBTI type is ISFP.
- Kevin’s blood type is O.
- Hoon’s blood type is B.
- Kiseop’s blood type is A.
Frequently Asked Questions (FAQ)
Who is UX1?
UX1 is a three-member South Korean boy group formed by former and current U-KISS members Kevin, Hoon, and Kiseop. They debuted on November 26, 2025, with the digital single “HALO”.
How many members does UX1 have?
UX1 has three members: Kevin, Hoon, and Kiseop.
When did UX1 debut?
UX1 officially debuted on November 26, 2025.
Who is the leader of UX1?
UX1 does not have a publicly announced leader.
Who is the oldest member of UX1?
Kiseop (born January 17, 1991) is the oldest member.
Who is the youngest member of UX1?
Kevin (born November 25, 1991) and Hoon (born August 16, 1991) are both younger than Kiseop. Kevin is the youngest overall.
What agency manages UX1?
UX1 is managed under UX1 Official. Kevin is also signed with FC ENM, Japan Music Entertainment, and UTA.
What is UX1’s fandom name?
UX1’s official fandom name is KISSme (키스미).
What are UX1’s official colors?
UX1’s official colors have not been publicly announced.
What was UX1’s debut song?
UX1’s debut digital single was “HALO,” released on November 26, 2025.
What other songs has UX1 released?
UX1 released a special digital single called “Winterland” on December 4, 2025.
Did the UX1 members previously work together?
Yes, all three members were previously part of U-KISS.
What is Kevin’s real name?
Kevin’s real name is Kevin Christopher Woo, and his Korean name is Woo Sung-hyun (우성현).
What is Hoon’s real name?
Hoon’s real name is Yeo Hoon-min (여훈민).
What is Kiseop’s real name?
Kiseop’s real name is Lee Ki-seop (이기섭).
How tall are the UX1 members?
What are the UX1 members’ blood types?
Where was Kevin born?
Kevin was born in Danville, California, USA.
Where were Hoon and Kiseop born?
Hoon was born in Namyangju, Gyeonggi-do, South Korea. Kiseop was born in Seongnam, Gyeonggi Province, South Korea.
What is UX1’s current status?
UX1 is active as of 2026, with ongoing promotions and events.
Conclusion
UX1 represents a beautiful union of talent, history, and friendship. Formed by three members of U-KISS—Kevin, Hoon, and Kiseop—the group brings together over 50 years of combined industry experience. Their debut in November 2025 marked not just the beginning of a new group, but the continuation of a legacy that has touched millions of fans worldwide.
The members’ individual journeys are remarkable in their own right. Kevin’s transition from XING to U-KISS, his successful hosting career, and his recent role as a judge on Produce 101 Japan demonstrate his versatility and enduring relevance. Hoon’s decade-long commitment to U-KISS and his seamless reintegration into UX1 showcase his dedication to performance. Kiseop’s evolution from main dancer to songwriter—co-writing UX1’s debut single “HALO”—reveals his artistic growth.
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