Guide to be King of the Dead is a Manga/Manhwa/Manhua in english language, Adventure 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

When she opened her eyes, she was in the underworld. Suddenly, she became a possible successor for the position of Lord of the Dead! Ji-hwa, who was once an ordinary job seeker, now embarks on her journey to become the King of the Dead.