Soul Empire Chronicles

http://www.webtoons.com/en/challenge/soul-empire-chronicles/list?title_no=60556 Lukas is a soul collector. He hates his job, he hates the Underworld, and he hates angels even more. One day, the Oracle requests his help in finding her successor in the Human world. He decides he's had enough and wants to retire too, marking the beginning of some epic troubles.