ArtistiNKODE Entertainment
Jaein
Jin Jae-in (진재인), known professionally as Jaein, is a South Korean singer and member of boy group KEYVITUP under iNKODE Entertainment. Born on October 20, 2007, in Wolgye-dong, Nowon-gu, Seoul, he is one of two members born in 2007 and falls under the Libra sign. He grew up with an older brother and a younger sister, attending Dong-cheon Elementary School, Yongin Hanbit Middle School, and Youngdong High School. His musical sensibility developed alongside everyday habits: shopping, night walks, and an ever-present musical soundtrack.
Jaein was introduced to the public on December 23, 2025, as one of the final trainees revealed through iNKODE’s INTHE X Project. The agency’s eleven-member pre-debut training program was built to form its inaugural boy group lineup. On February 25, 2026, he was officially confirmed as a KEYVITUP member, joining previously revealed groupmates Hyunmin, Taehwan, Sena, and Rukia. His MBTI type is ENFP, consistent with the group’s broadly expressive energy.
KEYVITUP, named for a convergence of “key,” “vital,” and “up,” debuted on April 8, 2026, with a self-titled EP under Kim Jae-joong’s iNKODE Entertainment. As one of the group’s Korean vocal contributors, Jaein brings emotional range and Seoul-rooted charisma to a five-person lineup bridging Korean and Japanese backgrounds.
1 articles2 creditsDebut: April 8, 2026Korean
Gallery
KEYVITUP individual concept photo (Set 1), iNKODE Entertainment, March 2026
KEYVITUP individual concept photo (Set 2), iNKODE Entertainment, March 2026
Discography
2026
KEYVITUPEP
Other Credits
2025
INTHE X ProjectPROJECT
Fans Also Ask
Who is Jaein of KEYVITUP?
Jaein (Jin Jae-in, 진재인) is a South Korean singer and member of KEYVITUP, a five-member boy group under iNKODE Entertainment. Born October 20, 2007, in Seoul, he was revealed as a KEYVITUP member on February 25, 2026, after joining the INTHE X pre-debut project in December 2025.
When did KEYVITUP debut?
KEYVITUP debuted on April 8, 2026, with their self-titled EP under iNKODE Entertainment, the label founded by Hallyu artist Kim Jae-joong. The group consists of five members: Hyunmin, Taehwan, Sena, Jaein, and Rukia.
What was the INTHE X Project?
INTHE X was iNKODE Entertainment’s pre-debut trainee program, introducing eleven male trainees beginning in November 2025. It formed the pool for two groups: KEYVITUP (five members) and VAY ONN (six members). Jaein was the last KEYVITUP member revealed, announced December 23, 2025.
What is Jaein’s MBTI type?
Jaein’s MBTI type is ENFP. His hobbies include shopping, night walks, and listening to music. He grew up in Wolgye-dong, Nowon-gu, Seoul, with an older brother and a younger sister.
What school did Jaein attend?
Jaein attended Dong-cheon Elementary School, Yongin Hanbit Middle School, and Youngdong High School before beginning his trainee career under iNKODE Entertainment.
