Kim Jae Han is a member of the boy group OMEGA X, formerly under Spire Entertainment, which debuted on June 30, 2021, and a former member of WYNN Entertainment's boy group SPECTRUM. He is also a former member of the duo OneVoices, which disbanded in 2016. In 2017, he participated in Produce 101 Season 2 whilst under MMO Entertainment and was eliminated in episode 4, at rank 81. In early 2018, he left MMO Entertainment and signed with WYNN Entertainment.

He wrote and produced the songs ''How about you'', ''Dark Light'', ''You'' and ''Shadow'', all sung by Dae Hyun from B.A.P. He also released his own version of the song ''How about you''.

In October 2022, a video of the CEO of OMEGA X's label abusing him and his group members came to light. After more videos and evidence were revealed, the members stepped forward with the intention to file a lawsuit against their company to cancel the exclusive contracts and to file for the trademark of their group name. In January 2023, OMEGA X won the lawsuit and officially ended their contract with Spire Entertainment.

On May 8, 2023 OMEGA X took to Instagram to share the news that they came to terms with SPIRE Entertainment after they mutually agreed to end their exclusive contract as well as all other disputes.

On July 3, 2023 it was announced that OMEGA X has signed with IPQ Entertainment. Edit Biography