Hyunwoo was a seasoned member of an idol band about to debut, but after a severe accident on set left him scarred, he abandons his dreams of stardom and becomes an idol trainer. Bitter about his current trajectory, he wishes for time to turn back...and after a plane crash, it does! Suddenly, he’s nineteen again, with no scar in sight, a huge audience watching his group compete for the top spot on a music talent show, and loads of stage experience from his trainer days. Will he lead his group to fame or fade from the spotlight once again? 2o324j
Original Webtoon:
KakaoPage, Daum
Official Translations:
English, Japanese, Thai, T.Chinese, French
Note: Once Again Idol is the official english name on the korean platforms
165 Chapters (Ongoing)
S1: 50 Chapters (1~50)
S2: 40 Chapters (51~90)
S3: 45 Chapters (91~130)
S4: 65 Chapters (Ongoing) (131~)

In the beginning, the MC's struggles with hiding his knowledge and changing his tragic end keeps the story fun - but after ch 40/50 ish, the story gets SUPER stale and boring. Nothing interesting happens, MC becomes a Gary Stu, and its basically just the band talking to each other in the dorm for 40+ chapters. So, yeah. You've been warned.