I believe it's Once Again Idol. I also heard that the manhwa is about to end on 165 chapters, currently in 159 chapters
If I'm not mistaken it's "Once Again Idol".
https://www.mangago.zone/read-manga/once_again_idol/
But it's been a while since I last read it so I don't remember much. When you read too much idol manhwa, you mixed up the plot sometimes LoL
Wait I think I remember! Isn't it when they're doing that survival show audition? Or is that from a different manhwa?
Wasn't Magical Girl concept to change the genre also the same as the manhwa where mc had a scar before his regression? I forgot the title, does someone know?