Detective Investigation Files - Season 3 Episode 36

To satisfy SA, LUNG requests YI to be her foster brother. YI has to accept the request reluctantly. YUNG discovers that ERICA was also YIU's lover. He suspects her. CHIT is jealous of TUNG who has been so intimate with YUNG. KWAN invites YUNG and CHIT to dine with her. They come across RAN who is KEI's wife. RAN keeps her son's identity secret. RAN hurts ERICA. She admits that YIP and YIU were killed by her. However YUNG and YI suspect that she is only trying to protect her son. After investigation, they find that SING is RAN's son. SING impersonates a doctor so as to visit ERICA. He is discovered, so he keeps SA and LUNG as hostages. YI comes and warns SING. SING agrees to release one of the two girls. YI does not know what to do.