Moonchild

Since childhood, Bak-Ha has been able to see "things" that others can't. On the first day at his new school, Bak-Ha meets Jin-Do, and due to the sickeningly sweet smell Bak-Ha has, Jin-Do notices he is different, just like himself. As they get closer, Bak-Ha finds out that he was the moonchild, the mythical creature who ruled the spirits in the past, and realizes that this is why the ghosts and demons are after him.

(Source: WEBTOONS, edited)