I’d recommend Monochrome Rumor. It doesn’t have a system, but has the “non-idol entering the body of an idol” trope. It’s suuuper cute and really good overall! These two are my favorite idol manhwas!
https://www.mangago.me/read-manga/monochrome_rumor/ reply
i don't get why everyone is getting mad at this post like: dudes, CHILL. its clearly a joke done just for shits and giggles. that being said, this gave me so much joy at 01:30 in the morning reply