Kichun

On January 12, 2012, Yeil Entertainment announced that new members would be joining Twilight following the departure of three original members. He was introduced as one of the new additions on January 16 and officially debuted with the group on February 8 with their first mini album Twilight, under the stage name TN. In late 2012, Twilight presumably disbanded silently, following the deletion of their official Facebook page.

On October 8, 2015, Kichun debuted as a member of BIGFLO with the release of their third mini album Incant. Unfortunately, in December of 2016, Kichun had posted an apology letter on his SNS, confirming his departure from the group. On March 22, 2022, the official SNS accounts for the upcoming group WE:A was opened with their biographies for each platform including five names, with Kichun, being one of those members.