Sesange Nappeun Yongsaneun Eopda

Hyeonseok Choi achieves the title of world MMA heavyweight champion before dying in a truck accident. A fairy named Rahel offers him a chance to continue fighting in the afterlife as a hero but mistakenly sends him to the demon side. Trapped in the demon world, he manipulates his way into influential roles. Over time, he begins to realize that the conflict between good and evil is not as straightforward as it initially appeared.