Choi Woo Jin

On December 29, 2022, Woojin was introduced as a contestant of Boys Planet, which will air on February 2, 2023. On March 23, he was eliminated in episode 8 after ranking 50th place. On April 26, 2023, Redstart ENM announced that he, along with fellow Boys Planet contestants and labelmates Kim Min Seoung, Kum Jun Hyeon, and Hong Keon Hee, would be holding their first fanmeeting titled REDSTART BOYS 1st Fanmeeting "This Time is Our Turn" in Korea and Japan as TIOT.

TIOT debuted on April 22, 2024 with the mini album Kick-Start.