Looking for the name of an Asian horror movie. Vague details sorry?

Hi! I asked this question a while ago and unfortunately didn't get a response so going to try again. The movie I am thinking of starts out with a man digging out of what seems to be a shallow grave. He goes into a nearby home and finds a pregnant woman dead whom we are led to believe to be was his wife. He begins watching some home movies and starts crying and goes on the hunt for who he thinks has killed his wife and search for his kids. The twist of the movie is that the guy we are watching is actually the killer and is playing some kind of game that involves burying himself and going into a coma like state and when he wakes up his memory isn't all that clear and he hunts for the victims. The ending he finds another family to do this with. I hope this makes sense =/