Necromancer (Hongjacga) is a Manga/Manhwa/Manhua in english language, Mystery 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

Death is usually the end, but for Erik, it’s just the beginning. Though he can’t remember anything before he died, he remembers that he wants revenge and a reason why he was killed. Together with Moll, the mysterious girl who brought him back, the two embark on a journey to find out who they are and what circumstances put them in their current predicament.