The Second Life of an All-Rounder Idol is a Manga/Manhwa/Manhua in english language, Drama series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Si-yoon, the leader of the idol group in their eighth year ⟨Nu-Bois⟩ died in a truck accident on his way to a press conference because of a drug scandal involving a group member. After that incident, he regressed back to his days as a trainee ten year ago, adopting a new mindset to establish his position to become an idol. Along the way, he pushed out the group members prior to regression to form a group with the members that he wanted, but… Will Si-yoon, the all-rounder idol, who did everything from the production to the promotion, be able to make a successful debut?