Butterfly Valley (나비계곡)

The Mara destroyed everything in its path, including the Awakened. It selected humans with the stigmata of each sign in the night sky, except for one—Shin Hyuk Lee. This lone Awakened dealt the final blow against the Mara. Upon achieving such a feat, Vega, the goddess of Lyra, appeared to grant his wish. Shin Hyuk wished to go back with the Lyra stigmata to prevent this tragedy from happening again. Upon returning, Shin Hyuk’s body rejected the Lyra stigmata and died... with the Mara beside him.

Oh Kangwoo the Demon King has had it with ruling over Hell and wants to return to Earth. But when he finally gets there, not only are his powers sealed, but the Earth he once knew has turned into an MMORPG free-for-all. Dimensional gates have appeared all over the world, and "players" enter them to make a living by hunting monsters. If Kangwoo wants to survive in this dangerous game, he's going to have to level up, and fast. But for this demon king, hell on earth might be worse than Hell itself!