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.