When a loving man lets his wife be detained in a mental hospital because she keeps seeing their dead son, he starts seeing the boy himself. After a long mental struggle he finally accepts his wife wasn’t mentally ill after all and he lets her back in only to find out she isn’t his wife anymore, but possessed by a demon which already took their son in the past. If he really loves her, he has to kill her. (just as she did with their son in the past)