I definitely recommend the original novel.
It's the best idol webtoon.
His first start is his life as an idol due to a regression by the introduced system.
He's preparing for a difficult Korean survival idol debut, but it's a little cruel because it's so realistic. (Realistic comments, cruel by people's reaction)
It is a story that makes people more immersed in idol life, which seemed to be smooth since its debut, encounters various events.
My favorite person is Cheongryeo (Shin Jaehyun), who was a senior idol who was completely psycho and criminal at first, but he actually had a lot of hidden stories and is actually a very lovely and good dog owner!
I can be confident that I enjoyed the most out of all the webtoons and novels I've seen on Idol Story!!
(The sentence may be poor because it is written using a translator)