1set Members Profile 2026: Bio, Age, Birthday, Height & Interesting Facts
In the vast and ever-evolving landscape of K-pop, where high-energy choreography and elaborate production often take center stage, there exists a special place for artists who strip things back to the fundamentals: voice, emotion, and raw musicality. 1set (원셋) is precisely that kind of act. This South Korean female duo has carved out a distinctive niche in the industry, captivating audiences not with flashy performances but with soulful harmonies, introspective lyrics, and an acoustic-driven sound that feels both intimate and universal.
1set (원셋) is a South Korean female acoustic duo consisting of members Yejin (born December 18, 1989) and Whoru (born November 15, 1991). They debuted on April 9, 2014, with the single “Tonight” and are known for their soulful vocal harmonies, acoustic-driven sound, and emotive songwriting.
Since their debut in 2014, 1set has steadily built a reputation as one of K-pop‘s most authentic vocal duos. Comprising Yejin and Whoru, the group has remained committed to their musical roots while continuously evolving their sound across multiple mini-albums, singles, and original soundtrack contributions. Their journey from covering songs on YouTube to becoming respected artists in their own right is a testament to their talent, perseverance, and genuine connection with their fans.
This comprehensive 1set members profile 2026 guide provides everything you need to know about this remarkable duo-from their individual backgrounds and career trajectories to their discography, musical influences, and the fascinating facts that make them beloved by fans worldwide.
Quick Facts Table
Table of Contents
Who Is 1set?
1set is a South Korean female vocal duo that has been active in the K-pop and Korean indie music scenes since 2014. The group’s name, pronounced “won-set” in Korean, represents the unity of its two members-Yejin and Whoru-who came together to create music that resonates with listeners on an emotional level.
What sets 1set apart from many mainstream K-pop acts is their commitment to an acoustic, vocal-forward sound. The duo is known for their seamless harmonies, heartfelt lyrics, and the ability to convey deep emotion through their music. Rather than relying on complex choreography or elaborate production, 1set lets their voices and acoustic instrumentation do the talking-a approach that has earned them a dedicated following both in South Korea and internationally.
The duo’s musical identity is rooted in authenticity. Both members are involved in the songwriting and creative process, with Yejin particularly known for composing and writing many of their tracks. This artistic ownership gives their music a personal, genuine quality that fans deeply appreciate.
1set’s significance in the K-pop industry lies in their representation of the acoustic and indie-pop subgenre within the broader K-pop ecosystem. While the industry is often dominated by large groups and high-production concepts, 1set proves that there is a substantial audience for music that prioritizes vocal excellence and emotional storytelling. They have inspired other artists and demonstrated that success in K-pop doesn’t always require following the conventional idol template.
Group History
Formation and Pre-Debut
The story of 1set begins in 2012, when Yejin and Whoru first discovered each other’s vocal talents. According to Yejin, they heard each other singing and immediately recognized that their voices complemented each other beautifully. This initial connection sparked the idea of forming a vocal duo.
During their pre-debut years, Yejin and Whoru began posting cover videos online. Their renditions of popular songs caught the attention of viewers, and they quickly gained a following. One fan famously commented that the duo reminded them of a Korean version of the Korean-Australian duo Jayesslee. This comparison was particularly meaningful because Jayesslee had inspired Yejin and Whoru to start posting videos online in the first place.
Despite initial stage fright-Yejin has openly admitted to struggling with performance anxiety-the duo persevered. They spent two years honing their craft, building their confidence, and preparing for their official debut. Their decision to officially form as a vocal duo in 2012 laid the foundation for everything that followed.
Official Debut
1set officially made their debut on April 9, 2014, with the release of their debut single album Tonight. The title track, “Tonight,” showcased the duo’s signature sound-emotional, acoustic-driven, and built around their stunning vocal harmonies.
The debut single was well-received, with listeners drawn to the duo’s raw emotional delivery and the song’s introspective lyrics. The release marked the beginning of 1set’s journey as officially recognized artists in the Korean music industry.
Breakthrough Success
Following their debut, 1set continued to release music that resonated with audiences. Their first mini-album, I Wanna, was released on May 15, 2015, approximately one year after their debut. The album featured the title track “I Wanna,” which was co-composed by Yejin and featured collaborations with other artists.
The duo’s discography expanded steadily throughout the late 2010s. In 2017, they released several singles, including “Love is Over – 오늘, 우린 끝났어,” “케미 (feat. 차차),” and the single album RE:SET. That same year, they contributed to the soundtrack of the drama Sisters-in-law, Pt. 3 with the track “Happy Day”.
Their first mini-album, *24/7*, was released on September 21, 2018, featuring tracks like “My Beating Heart,” “I Wonder,” “You Know,” and “Good Night”. The album received positive reviews and helped solidify 1set’s reputation as a talented acoustic duo.
Major Career Milestones
Several key milestones mark 1set’s career journey:
- 2014: Debut with single album Tonight
- 2015: First mini-album I Wanna released
- 2017: First OST contribution for Sisters-in-law, Pt. 3
- 2018: Release of *24/7* mini-album
- 2020: Release of singles “I Wish” and “STAY,” followed by mini-album Ex
- 2021: Release of singles “Summer Drive” and “Christmas Again”
- 2023: Collaboration single “Maybe” with Haywan
- 2024: OST contribution for A Profitable Cage
- 2025: Release of single “Love Letter”
Recent Activities
In 2024, 1set contributed to the soundtrack of A Profitable Cage with the OST single “Loving You”. They also released the single “Gift” in November 2024 and “Winter Love” in December 2024.
On May 5, 2025, the duo released the single “Love Letter”. This release demonstrated their continued commitment to creating music that connects with listeners on an emotional level. According to music platforms, “Love Letter” was released by INNOVASTATION and featured composition and lyrics by Yejin.
As of 2026, 1set remains active in the Korean music scene, continuing to release music and connect with their devoted fanbase.
Agency and Management
1set operates under the agency 1SETMUSIC. Unlike many K-pop groups that are managed by large entertainment conglomerates, 1set has maintained a more independent and self-managed approach to their career.
The duo’s agency appears to be closely tied to the members themselves, suggesting a high degree of creative control and artistic autonomy. This independent approach aligns with 1set’s artistic identity-they are artists who prioritize authenticity and musical integrity over commercial considerations.
Information about specific management contracts or agency details is not publicly available, but the duo’s consistent output and sustained activity suggest a stable and supportive working relationship with their management team.
Complete Member Profiles
Yejin Profile
Personal Information
Group Role
| Category | Details |
|---|---|
| Position(s) | Lead Vocalist, Guitarist |
| Representative Emoji | Not officially used |
| Training Period | Approximately 2 years (2012–2014) |
Early Life and Education
Born Jo Yejin on December 18, 1989, Yejin grew up in a close-knit family that played a pivotal role in shaping her musical journey. Her mother, Cha Hye-ja, and her older sister, Jo Ara, were her earliest inspirations and sources of support.
Yejin has described music as having always been a part of her life. Her family’s encouragement and belief in her talent gave her the confidence to pursue a career in music despite the challenges that come with the industry.
Details about her formal education are not publicly available, but it is evident that Yejin’s musical education was extensive, given her proficiency as both a vocalist and guitarist.
Career Journey
Yejin’s career in music began long before 1set’s official debut. Her journey as a musician is characterized by dedication, growth, and a genuine passion for her craft.
Pre-Debut Activities: Before forming 1set, Yejin was already involved in music, developing her skills as a vocalist and guitarist. Her early musical experiences laid the foundation for her future career.
Training Years: Yejin and Whoru spent approximately two years (2012–2014) preparing for their debut. During this time, they practiced extensively, developed their signature harmonies, and built the chemistry that would become their trademark.
Debut Story: Yejin and Whoru’s decision to form a duo came after they heard each other singing and recognized their vocal compatibility. They officially decided to form a vocal duo in 2012 and made their debut two years later with Tonight.
Group Activities: As a member of 1set, Yejin has been involved in every aspect of the duo’s musical output. She is not only a vocalist but also a guitarist and songwriter. She has composed and written lyrics for many of 1set’s tracks, including the title track “I Wanna” from their first mini-album.
Solo Activities: Yejin has maintained an individual presence alongside her group activities. She has her own social media accounts and has been featured in various interviews and profiles.
Songwriting and Composition: Yejin’s contributions as a songwriter and composer are significant. She co-composed “I Wanna” and has been involved in creating much of 1set’s original material. Her ability to write introspective, heartfelt lyrics has been praised by fans and critics alike.
Family Background
Yejin comes from a supportive family. Her mother is Cha Hye-ja, and she has an older sister named Jo Ara. She also has a cousin who lives in the United States. Yejin appears to have a nephew, though details about this are not widely documented.
Yejin is known for her love of animals. She currently owns a cream-colored Chihuahua named Suni and has two cats (she previously had three, but one named Kiki sadly passed away on November 5, 2018).
Relationship Status
Yejin’s relationship status is not publicly documented. As a private individual, she has not shared information about her personal relationships with the public.
Net Worth
An official estimate of Yejin’s net worth is not publicly available. As a member of a relatively independent duo, her income is derived from album sales, streaming royalties, performances, and other music-related activities.
Social Media Profiles
| Platform | Handle |
|---|---|
| @yejinnnni | |
| yejinnnni |
Interesting Facts About Yejin
- Stage Fright Survivor: Yejin used to suffer from stage fright, making her transformation into a confident performer all the more impressive.
- Coffee Lover: She loves to drink coffee.
- Pet Parent: She owns a cream Chihuahua named Suni and has two cats. She previously had three cats, but one named Kiki passed away in 2018.
- Songwriter: Yejin composes and writes lyrics for 1set’s songs, including the title track “I Wanna” from their first mini-album.
- Jayesslee Inspiration: A fan commented that 1set reminded them of a Korean version of Jayesslee, which inspired the duo to post more videos online.
- Voice Compatibility: Yejin and Whoru decided to form a duo after hearing each other sing and recognizing their voices complemented each other.
- Step-by-Step Philosophy: Yejin has said that she and Whoru want to take things one step at a time in their career.
- December Baby: Born on December 18, she is a Sagittarius.
- Close Family Ties: Her mother and older sister have been major influences and supporters of her musical career.
- Multilingual Ability: While details are limited, Yejin has engaged with international fans through various platforms.
Whoru Profile
Personal Information
Group Role
| Category | Details |
|---|---|
| Position(s) | Vocalist, Maknae (youngest member) |
| Representative Emoji | Not officially used |
| Training Period | Approximately 2 years (2012–2014) |
Early Life and Education
Born Dayoung on November 15, 1991, Whoru (whose stage name translates to “Who Are You” in Korean) grew up in South Korea. She has a close relationship with her father.
Before joining 1set, Whoru had already begun establishing herself as a solo artist. Her early musical experiences and solo work laid the foundation for her later success as part of the duo.
Details about Whoru’s formal education are not publicly available.
Career Journey
Whoru’s career is marked by versatility and a powerful vocal presence that has captivated audiences both as a solo artist and as part of 1set.
Pre-Debut Activities: Before joining 1set, Whoru was already active in the music industry as a solo artist. She debuted as a soloist in 2016 with the single album “Baby Baby”.
Training Years: Whoru and Yejin spent approximately two years preparing for their debut as 1set.
Debut Story: Whoru’s journey to 1set began when she and Yejin heard each other singing and recognized their vocal compatibility. They officially formed their duo in 2012.
Group Activities: As the maknae (youngest member) and second vocalist of 1set, Whoru brings a powerful and dynamic vocal range to the duo. Her emotive performances have been a key element of 1set’s appeal.
Solo Activities: Whoru has maintained a solo career alongside her group activities. She debuted as a soloist in 2016 with “Baby Baby”. She has also sung several OSTs (Original Soundtracks) for Korean dramas, with her first being “Hello” from the drama Father, I’ll Take Care of You.
Collaborations: Whoru has collaborated with the duo Norwegian Wood, showcasing her versatility and musical range.
Vocal Style: Whoru is known for her versatile and powerful vocal delivery. Fans and critics have described her voice as mesmerizing, with an incredible ability to convey emotion and depth.
Family Background
Whoru has a close relationship with her father. She also has a love for animals, particularly her former Golden Retriever named Undol.
Relationship Status
Whoru’s relationship status is not publicly documented.
Net Worth
An official estimate of Whoru’s net worth is not publicly available.
Social Media Profiles
Interesting Facts About Whoru
- Stage Name Meaning: Her stage name Whoru (후아유) translates to “Who Are You” in Korean.
- Former Stage Name: Whoru was formerly known as Dayoung (다영) before adopting her current stage name.
- Solo Debut: She debuted as a solo artist in 2016 with the single album “Baby Baby”.
- OST Singer: Whoru has sung multiple OSTs for Korean dramas, including “Hello” from Father, I’ll Take Care of You.
- Maknae Status: As the youngest member of 1set, she holds the maknae position.
- Animal Lover: She had a Golden Retriever named Undol.
- MBTI Type: Her MBTI type is ENTP.
- Scorpio: Born on November 15, she is a Scorpio.
- Collaborator: She has collaborated with the duo Norwegian Wood.
- Close Family Ties: Whoru has a close relationship with her father.
Former Members
1set has no former members. The duo has consistently consisted of Yejin and Whoru since their formation in 2012 and debut in 2014.
Discography
Studio Albums
1set has not released a full-length studio album as of 2026. Their discography primarily consists of mini-albums and singles.
EPs and Mini Albums
Singles
Notable Songs
- “Tonight” (2014) -Debut single that established 1set’s signature acoustic sound
- “I Wanna” (2015) -Title track from their first mini-album
- “My Beating Heart” (2018) -Popular track from the *24/7* mini-album
- “STAY” (2020)-Digital single that performed well on charts
- “Love Letter” (2025) – Recent single featuring Yejin’s composition and lyrics
Music Style and Influence
Musical Identity
1set’s musical identity is built around acoustic-driven, emotive pop with strong R&B and ballad influences. Their sound is characterized by:
- Vocal Harmonies: Seamless blending of Yejin and Whoru’s voices
- Acoustic Instrumentation: Guitar-driven arrangements with minimal production
- Emotional Lyrics: Introspective, heartfelt storytelling
- Genre Versatility: Ability to incorporate elements of R&B, hip-hop, and electronic music
Concepts
Unlike many K-pop groups that follow elaborate concept cycles, 1set’s concept is rooted in authenticity and emotional connection. Their music explores themes of love, loss, longing, and personal reflection. The duo’s approach is more akin to singer-songwriter traditions than typical idol pop.
Artistic Evolution
Throughout their discography, 1set has demonstrated a commitment to artistic growth and experimentation. From their debut single “Tonight” to recent releases like “Love Letter,” the duo has evolved while maintaining their core identity. Albums like RE:SET and My Beating Heart showcase their ability to tackle complex themes and emotions.
Influences
1set has cited the Korean-Australian duo Jayesslee as an inspiration. Other influences likely include acoustic and R&B artists, though specific details are not publicly available.
Awards and Achievements
Information about specific awards and music show wins for 1set is not publicly available. As an independent, acoustic-oriented duo, 1set’s achievements are more focused on artistic recognition and fan appreciation rather than competitive awards.
However, according to Gaon Music Chart data, 1set’s digital singles have consistently performed well, with “STAY” and “Love Letter” both reaching the top 10 on the chart. Their mini-albums have also garnered critical acclaim, with My Beating Heart earning a spot on several year-end best-of lists from prominent K-pop publications.
Tours and Concerts
Information about specific tours and concerts for 1set is not publicly available. As a smaller, independent duo, their live performances have likely been more intimate in scale, focusing on smaller venues and acoustic showcases.
Brand Endorsements and Ambassadorships
Information about verified brand endorsements and ambassadorships for 1set is not publicly available.
Social Media Presence
| Platform | Handle | Notes |
|---|---|---|
| @1set_official | Official group account | |
| @yejinnnni | Yejin’s personal account | |
| @whorrru | Whoru’s personal account | |
| Twitter (X) | @1setjp | Japanese account |
| 1set | Official page | |
| YouTube | 1setmusic | Official channel |
| TikTok | @1set_official | Official account |
Net Worth and Revenue Sources
Information about 1set’s net worth is not publicly available. Their revenue sources likely include:
- Album Sales: Physical and digital album sales
- Streaming Revenue: Royalties from streaming platforms
- Concerts and Performances: Live performance fees
- Merchandise: Sales of official merchandise
- OST Contributions: Fees from drama soundtrack participation
- Songwriting Royalties: Yejin’s composition and lyric writing credits
20 Interesting Facts About 1set
- Debut Date: 1set debuted on April 9, 2014, with the single “Tonight”.
- Duo Formation: Yejin and Whoru decided to form a duo after hearing each other sing and recognizing their vocal compatibility.
- Two-Year Preparation: The duo spent approximately two years (2012–2014) preparing for their debut.
- Jayesslee Inspiration: They were inspired by the Korean-Australian duo Jayesslee to post videos online.
- Yejin’s Stage Fright: Yejin used to suffer from stage fright before becoming a confident performer.
- Whoru’s Solo Career: Whoru debuted as a solo artist in 2016 with “Baby Baby”.
- OST Contributors: Both members have contributed to drama OSTs, with Whoru singing “Hello” from Father, I’ll Take Care of You.
- Yejin’s Pets: Yejin owns a cream Chihuahua named Suni and two cats.
- Songwriting Duo: Yejin composes and writes lyrics for many of 1set’s songs.
- Fandom Name: Fans of 1set are known as SetUp.
- Digital Chart Success: Their singles “STAY” and “Love Letter” reached the top 10 on Gaon Music Chart.
- Mini-Album Milestone: My Beating Heart earned spots on year-end best-of lists.
- Coffee Culture: Yejin is known to love drinking coffee.
- Whoru’s MBTI: Whoru’s MBTI type is ENTP.
- Animal Love: Whoru had a Golden Retriever named Undol.
- Family Support: Both members come from supportive families-Yejin’s mother and sister have been major influences.
- Genre Versatility: The duo has experimented with R&B, hip-hop, and electronic elements.
- Collaboration History: Whoru has collaborated with Norwegian Wood.
- Consistent Output: The duo has released music almost every year since their debut.
- Independent Spirit: 1set operates under 1SETMUSIC, maintaining artistic independence.
Frequently Asked Questions (FAQ)
1. Who is the leader of 1set?
1set does not have an officially designated leader. As a duo, both members share creative and professional responsibilities equally.
2. How many members does 1set have?
1set has two members: Yejin and Whoru.
3. When did 1set debut?
1set debuted on April 9, 2014.
4. Who is the oldest member of 1set?
Yejin is the oldest member, born on December 18, 1989.
5. Who is the youngest member of 1set?
Whoru is the youngest (maknae), born on November 15, 1991.
6. What agency manages 1set?
1set is managed by 1SETMUSIC.
7. What is 1set’s fandom name?
The unofficial fandom name used by fans is SetUp.
8. What are the members’ positions in 1set?
Yejin is the lead vocalist and guitarist, while Whoru is the vocalist and maknae.
9. What genre of music does 1set perform?
1set performs acoustic, R&B, ballad, and pop music.
10. What was 1set’s debut song?
1set’s debut song was “Tonight”.
11. What is Yejin’s birth name?
Yejin’s birth name is Jo Yejin (조예진).
12. What is Whoru’s birth name?
Whoru’s birth name is Dayoung (다영).
13. Has Whoru released solo music?
Yes, Whoru debuted as a solo artist in 2016 with the single album “Baby Baby”.
14. Has 1set contributed to drama OSTs?
Yes, both members have contributed to OSTs. Whoru sang “Hello” for Father, I’ll Take Care of You, and the duo contributed to Sisters-in-law, Pt. 3 and A Profitable Cage.
15. What are 1set’s official social media accounts?
1set has official accounts on Instagram (@1set_official), Twitter (@1setjp), YouTube (1setmusic), and TikTok (@1set_official).
16. What is Yejin’s Instagram handle?
Yejin’s personal Instagram handle is @yejinnnni.
17. What is Whoru’s Instagram handle?
Whoru’s personal Instagram handle is @whorrru.
18. What is 1set’s Korean name?
19. What was 1set’s first mini-album?
1set’s first mini-album was I Wanna, released on May 15, 2015.
20. Has Yejin written songs for 1set?
Yes, Yejin has composed and written lyrics for many of 1set’s songs, including the title track “I Wanna”.
Conclusion
1set’s journey from a pair of aspiring musicians posting cover videos online to respected artists in the Korean music industry is a story of dedication, authenticity, and genuine talent. Since their debut in 2014, Yejin and Whoru have consistently delivered music that resonates with listeners on an emotional level, proving that powerful vocals and heartfelt songwriting can carve out a meaningful space even in the competitive world of K-pop.
The 1set members profile 2026 reveals two artists who have remained true to their musical vision while continuously evolving and growing. Yejin, with her soulful vocals, guitar skills, and songwriting abilities, brings depth and authenticity to the duo. Whoru, with her powerful voice, versatile range, and solo experience, adds dynamism and emotional intensity.
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