"Wonder About Us! Hello, I'm Junseo!"
Kim Jun Seo (김준서; or simply Junseo) is a South Korean singer and rapper under OUI Entertainment. He is a member of the boy group WEi and a former member of the project group 1THE9. He was first known for appearing and competing in the boy group survival show "Under Nineteen" where he finished 9th place, allowing him to debut as a member of the project boy group 1THE9. Following the the group's contract expiration, Junseo continued to train.
On October 25, 2018, he was introduced as a contestant of Under Nineteen, as a part of the performance team. He finished in ninth place, thus becoming a member of the project group 1THE9.
On April 13, 2019, the group officially debuted with the mini album XIX. 1THE9 officially disbanded on August 8, 2020, following the release of their final mini album Good Bye 1THE9.
In 2020, Junseo was revealed to be a member of OUI Entertainment's newest boy group WEi.
Junseo debuted as a member of WEi on October 5, 2020 with their first mini album Identity : First Sight.