On December 18, 2018, he debuted with his first solo single “Jaehan Watch”.On July 10, 2020, WYNN Entertainment announced on SPECTRUM’s fan cafe that the group disbanded and the members’ contracts were terminated due to the company’s struggles.On March 26, 2021, Jaehan was officially revealed as one of the 11 members that were a part of the upcoming boy group OMEGA X. The group debuted on June 30, 2021 with the mini album Vamos.On June 15, 2022, it was announced, during the SHOW-CON of the first studio album Story Written in Music, that he is the official leader of the group, or rather the eldest, with also the comments of teammates saying that he has always led the whole group and given a strong support.Well known South Korean singer YouTuber Daud Kim has shared his latest photograph while performing Umrah.