YUNG and CHIT determine their date of marriage. In order to be a good wife, CHIT attends a cooking course. In the education centre, she meets a mysterious lady who intends to attend all courses. CHIT finds a vague image of the lady in her mind. She remembers that the lady is called TUEN MUK CHI. There was a lady with the same name who committed suicide six months ago. YUNG checks the file again and learns that the victim had left a letter to CHRIS before she killed herself. According to the record, CHI lived in CHING’s house. CHING is attacked and her house has been searched. CHIT suspects that CHRIS is NAM who works as a tutor in the education centre. However NAM is killed with a knife in the show room.