Trying to find a name of an Asian horror movie about a guy who puts himself into a coma like state?

Hi! I don't know if coma state is the proper way to describe what he does so I apologize. I saw this move late night on a streaming site and was watching it half asleep. But this man for some reason injects himself with some kind of liquid in a needle which knocks him out for a specific amount of time and then buries himself. When he digs his way out of the hole we are initially led to believe he was put there by someone else and a murderer is stalking him and his family. The twist was he was the killer and was doing this sick game for fun. Any help would be appreciated!