Ain

On September 4, 2013, Ain debuted as a member of NOM with their digital single "누난 예뻐". Unfortunately, on February 1, 2016, an official statement was posted on NOM's Facebook, announcing their disbandment. On January 4, 2017, Ain then debuted as the leader and main dancer of TST (then known as TopSecret) with the release of their debut mini album Time's Up.

However, many people speculate that the group has disbanded due to inactivity since October 2020. On October 29, 2024, EPIC TRAVELS revealed their official logo on Twitter along with its five current members, Jung Eden, Ain, G. I, Sangho and Jinhoo.