FAY and HAY are old friends. HAY's husband owns a magazine. CHIT is aware of the friendship between FAY and HAY. One day FAY and HAY go out with HAY's son BOR. BOR is knocked down by a car and dies. HAY blames herself and feels guilty. SA asks YI to investigate her mother's death. Her mother YING died eighteen years ago. As SA finds a letter left by YING, she believes that YING did not kill herself. TIN was responsible for YING's case, so YI asks him. Later YI and LUNG go to TIN's home and from his neighbor, YI learns that TAI B visited TIN frequently and on the day of YING's death, he was also there. KWAN stays in Hong Kong and runs a restaurant. She is cheated by the workers of renovation. TIN helps her but is hurt. In the hospital, the doctor recognizes TIN and tells TIN that he has recently seen TAI B - MONG.

YI, SA and LUNG visit MONG but MONG cannot recall anything. CHIT introduces TUNG to help KWAN in her shop. TIN's friend KIN comes to avenge TIN's being hurt. KWAN calls the police. In order to settle the case, TIN gives money to KWAN and the workers as compensation. HUNG's daughter YEE is murdered. YUNG and YI investigate the case. Beside YEE's corpse, TIN finds some hair and a hat. He recalls that the situation is similar to YING's case. He tells YUNG. YUNG continues his investigation. SA and MONG are hypnotized. MONG recalls that SA was asked to lock the door. They conclude that YING knew the murderer. SA's uncle LEUNG had filthy relationship with YING. YI finds LEUNG before YING's tomb. LEUNG claims that he is not the killer. SA goes to find her grandmother and comes across CHU. CHU tells her that they were neighbors and SA frequently visited him.

TIN remembers that the curtains were hanging on the window when the murder happened. Believing that MONG has lied, YI and YUNG go to question him. MONG does not admit telling lies. HUNG recalls the case and accuses MONG as the murderer. MONG admits he is the killer. YUNG and YI find the case suspicious. Moreover MONG does not like the wanted criminal. They ask CHU. CHU tells them that MONG has a brother ON who is an idiot. They find him and realize that he is the wanted one. ON tells them what he did. MONG also tells the truth.

SA breaks up with her boyfriend. YI knows that he has a chance. As ON is mentally ill, the government does not accuse him. HUNG is unhappy. Later ON falls down from the roof of the hospital and dies. HUNG is suspected. KWAN has to delay the opening of her restaurant but she still has confidence in it. TIN admires KWAN but KWAN is more interested in HUNG. FAY and HAY are found going into a hotel together. The others are discontented, especially YUNG. YUNG wants to have a baby but CHIT does not agree. Later YUNG finds her being on pills.