Superstar Associate Manager is a Manga/Manhwa/Manhua in english language, Comedy 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

Hoyeon Cheon is an associate manager at Korea Capital, a finance company where his career is stagnating. One night, stuck with the cleanup after a long evening of karaoke with colleagues, he decides to sing one more song. Little does he know that the ghost of the wild-child rock star Jihyeok Han has been waiting, hoping to find the perfect vessel for his superstar aura…