Lee Se Jin, known simply as Sejin, is a South Korean singer, dancer, former member of 14U (원포유) and current member of D-ONE (완료).

He made his debut in July 2017 as 14U's vocalist and dancer with their first single album, "VVV". The group was not able to promote much as allegations of abuse and an inappropriate relationship between a member and a female executive derailed any efforts to gain a fanbase. In May 2019, BG Entertainment (백곰엔터테인먼트) announced the group's disbandment after 13 members decided not to renew their contracts.

After switching agencies, he joined A Entertainment (에이플러스엔터테인먼트) in November 2019 and 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, the agency suspended the group's activities in November 2020 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 even debuting in early 2021.

He then was a pre-debut member of YOURS (유얼스) under Deep Studio Entertainment joining in mid-2021. The 17-member group never got to officially debut as the agency kept delaying the debut date and eventually disbanding the group in September 2021.

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

(Source: MyDramaList) Edit Biography