Silver Demon King

South Korean high school 3 Ha Yuan-an who ruined the water test by a marking mistake. In front of him, a beautiful foreigner, or a demon, appears and offers to return the time. Instead, they say to be the devil's band... . Can Yuan, who suddenly lives the life of the Demon King, can return safely? "Shall I just live my own way? I'm real until the real thing comes back!"