My Second Life as an Idol is a Manga/Manhwa/Manhua in (English/Raw) language, Manhwa series, english chapters have been translated and you can read them here.
From failed idol to hailed idol! Flop idol Yongmin dies an unfortunate death but is given a second chance at life in the body of Ian, a super hot rich kid with a voice to match. At his side, he finds Jin, a mysterious soul tasked with guiding Ian to becoming a certified star. But is it really all smooth sailing from here?