Episode 18 - S1.E18

That year when assigned to arrest the robbers, Lam was responsible for Tsing's father's death because he was scared of death. Ting witnessed it and he now threatens Lam to help him. Not wanting to lose his reputation, Lam decides to kill Hui, Cheung and Ting. Ting is killed and Wai is assigned to investigate the case. Finding out that Ting is in fact one of the three robbers, Wai asks Lam for information but the latter tries to avoid the topic. On the other hand, Wai finds that the murderer is extremely cautious in his act and realizes that it is no easy job to crack the case.

Lam is much worried that he would be arrested and thus he decides that after Wai and Ching get married, he would emigrate with Lan and spend peaceful days together. On the day of the marriage, Wai and Ching discover that Lam is in fact the murderer and ask him about it. Not wanting to spoil the occasion, Lam promises to explain to them in late night.