Watch Detective Investigation Files Season 3 Episode 21 Online

After investigation, it is certain that the dead man is FAY, YUNG's brother, YUNG is in deep grief, He works round the clock, hoping he can find the killer, He recalls that FAY has fought with YIP WAI, TIN finds MAR HO HING, who is believed to be the last one seeing FAY before he was killed, HING admits that she met FAY but nothing was special, She only informed FAY that HAY wanted to leave him, YUNG's father and younger sister come. They are also very sad. From the record on blood type, YI discovers that HAY's son is not HOI's. Instead FAY may be his father. On the other hand, LUNG finds a video tape shot by FAY. She gives it to YUNG.