Aflame Inferno

Aflame Inferno (불꽃의 인페르노) is a Korean manhwa series written by Dall-Young Lim and illustrated by Kwang-Hyun Kim, the former who is known for writing Unbalance Unbalance, Zero, and the Japanese manga Black God.

Plot
A self-absorbed high school student gets caught in the middle of a battle of demons (called "Tedlars"). He is nearly killed but is saved when the Tedlar named "Inferno" merges with him. Now he must hunt down Tedlars while keeping up with his studies.