Lee Se Jin, known simply as Sejin, is a South Korean singer, dancer, and member of the boy group D-ONE (완료). He was formerly a member of the group 14U (원포유).

In July 2017, Se Jin made his debut as 14U's vocalist and dancer with their first single album "VVV." In May 2019, BG Entertainment (백곰엔터테인먼트) announced the group's disbandment after 13 members decided not to renew their contracts.

After switching agencies to A Entertainment (에이플러스엔터테인먼트) in November 2019, he was set to re-debut as part of the agency's new idol group UTH (유스). However, the group disbanded for undisclosed reasons in early 2020 without having debuted. He joined C on H Entertainment in mid-2020 and was set to become a member of their new boy group temporarily named C on H (씨온에이치). Suddenly, however, the agency suspended the group's activities that November and he left the company. He and 2 more C on H trainees moved to Floret Entertainment and were promised to debut in the new boy group called FLORET (작은 꽃). Unfortunately, the agency disbanded the group without debuting in early 2021. He later became a pre-debut member of YOURS (유얼스) under Deep Studio Entertainment. The agency kept delaying the debut date before eventually disbanding the group in September 2021.

In November 2023, Se Jin signed with Mainbase Entertainment and he re-debuted as D-ONE's sub-vocalist, dancer and maknae. The group had debuted the year previous, and he joined to replace a fellow former 14U member. They are mainly promoting in Japan.

(Source: MyDramaList) Edit Biography