My Ex 2: Haunted Lover

My ExHaunted Lover is a 2010 Thai Horror film, a sequel to My Ex.

A flashback shows that Cee was directly responsible for Yings death, and Aof was framed by Cee for Yings murder and Cee kills Aof with a knife and hit his head with a stone in the room.. Not long after, Bowie came back into their room and found Aofs corpse on the floor. Cee recalls that when she was a child, Bowie often tormented her, and now, Cee stated that her sister was trying to steal Karn from her too. Cee killed Bowie with the stone.Karn returns to the hotel and saw that the power was down and told the staff to repair it. But when he goes to see Cee and Bowie in their room, Cee got a hallucination from Yings ghost, and mistaking Karn for Yings ghost, stabbed him with the knife to his chest. ........

Source: Wikipedia