His interest in music began in middle school upon hearing Justin Bieber's songs.

[2] In 2022, he entered the Department of Broadcasting and Entertainment at Global Cyber University together with his fellow members.

[9] It was also during this time that his rise to fame courtesy of his BL drama, Semantic Error, had led the group to increase its album sales and popularity.

He held a showcase at Yes24 Live Hall, where he presented his first solo mini album JC Factory.

[13] In 2019, Jaechan got his first main role in a Tooniverse web drama, My YouTube Diary, along with his co-member, Munik.