Tenant Mr. Li of an apartment high-rise is weary of the return of his late mother's ghost. When she appears in the apartment, she haunts Li and his wife, who she blames for her death. Caught in the commotion is a crazy girl named Kwan and the apartment building's inept security guards. They are repulsed by all the paranormal activity; therefore, they seek the unlikely help of an escaped mental patient, Leon, a Professional-type wannabe who just happened to be passing by the apartment high-rise when all the ghostly events were taking place.