In this horror movie, Alex FONG plays the role of a university student Eric. The story begins with Eric and his schoolmate, "chatter box" Chuen (starring Sammy LEUNG), moving into an empty Public Estate unit for a temporary stay in order to focus on their revision and preparation for examinations. Living in the spooky flat numbered 666, they immediately feel something wrong about it. Eric also sees two men and two girls running in the hallway and a man shows up with blood all over his body. A series of even more horrible incidences occur afterwards.