Sam Jie calls Laughin to the cemetery and questions him about his past. Laughin admits that he was once a police officer-in-training. But he was kicked out of the academy even before graduating. He has been in Chun Hing for over 9 years, he argues that if he was an undercover cop, Chun Hing would not have progressed.
Laughin tells Sam Jie that if she still doubts him, he will call Hau Ko out and let Hau Ko be the judge and see if he really is an undercover cop. Sam Jie agrees. While waiting for Hau Ko, Laughin slips some drug in Sam Jie's wine and make her unconscious.
Hau Ko calls Laughin and wants to bring him to the drug production factory. On their way over, Chung took many detours to throw off the police. However, they encounter an E.U. truck on their route and Hau Ko decides to cancel the trip to the factory.
Sam Jie's maid calls Hau Ko and informs him that Sam Jie did not return home. Laughin is worried and excuses himself. He goes back to the hotel room where he dropped Sam Jie earlier. Sam Jie is awake now but is groggy. Laughin begs her not to expose his past to Hau Ko.
Laughin visits Sam Jie with a bouquet of flowers. He overhears Sam Jie's phone call with her dance instructor. The dance instructor could not teach Sam Jie dancing so Laughin offers to be her teacher. Sam Jie feels a connection with Laughin while dancing, and Laughin was pleased.
It appears all that sam Jie has been doing is a trap. Hau Ko taught Sam Jie to pretend to fall for Laughin so she could get close to him and investigate further if he is indeed an undercover cop. Looks like Laughin's identity is in trouble!
Sam Jie goes grocery shopping with Laughin and takes the opportunity to cook dinner for him at his house. When they are at Laughin's place, Sam Jie asks Laughin to buy her a bottle of sauce which she forgot to buy. Once Laughin is out of the house, she snoops around for evidence that may incriminate Laughin. After dinner, Laughin gave Sam Jie a necklace as a sign of his affection for her.
Sam Jie could not find any evidence that points out Laughin is an undercover cop. Hau Ko begins to suspect his sidekicks including Lap Man. Hau Ko praises Lap Man's performance at Mega Disco. Laughin warns Lap Man not to be carried away just because Hau Ko praised him.
Hau Ko assigned Lap Man to receive a new batch of drugs. After receiving the drugs, Lap Man is suppose to pass the drugs to Chung. But when Chung opened up the briefcase, the drugs are missing. He accused Lap Man of stealing them. Hau Ko is very angry and wants to kill Lap Man. Hau Ko asks Laughin to do the deed as Lap Man is his follower. Laughin has no choice but to pull the trigger.
Hau Ko instructs Laughin to pull the trigger on Lap Man but the gun turned out to be empty. Hau Ko said he was putting the two of them (Laughin and Lap Man) through a test as he needs the most loyal people to help him in the drug business.
Lap Man blames Laughin for not standing up for him and confronts Laughin about it. Laughin explains that he has no choice as he has to execute any instructions given to him by the leader. They got into a heated argument with Lap Man announcing that he will severe all ties with Laughin.
Sam Jie hears about their argument and goes to Laughin's house to console him. Sam Jie also confesses to Laughin that she only pretended to accept him as her boyfriend to investigate if he is an undercover cop. Sam Jie said she has no romantic feelings for Laughin but only treats him as a friend. Laughin agrees to remain friends with Sam Jie. He asks her to keep the necklace he gave her earlier as a token of their friendship.
Sam Jie drops the necklace that laughin gave her. Hau Ko sees her frantically looking for the necklace and helped her. When he found out that the necklace was given by Laughin, he was jealous. Due to this reason, Hau Ko also banish Laughin from getting near to the drug factory.
Hau Ko summons Laughin to Mega and questions him about the necklace. Laughin admits that he gave Sam Jie the necklace when he was pursuing her. Hau Ko becomes enraged and brings out his gun. He loads the gun in front of Laughin and asks Laughin to take his own life there and then. Laughin begs Hau Ko for a chance to survive but Hau Ko refuses to listen. When Laughin was about to pull the trigger, Hao Ko took the gun off his sweating hand. Hau Ko changed his mind because Laughin had saved his life during the bomb blast at Jor Lun's house.
It appears Hau Ko was still testing Laughin. When Hau Ko asked Laughin to pull the trigger on Lap Man, Laughin's hands were steady as rock. In all his 9 years at Chun Hing, Laughin has never killed anyone with a gun. Someone who never had the experience of firing a gun will not have steady hands when firing it for the first time. Hau Ko thinks that Laughin is an undercover cop because he has experience firing guns and is not afraid.
Lap man meet up with Pak Kiu at a secret location and gave Pak Kiu his blessings for Pak Kiu's wedding the next day. Lap Man also warned Pak Kiu to be wary of Laughin. Lap Man explains that laughin is power crazy and is willing to do anything to gain power, including pulling at trigger at Lap Man.
Hau Ko pretends to arrange for Lap Man and Laughin to visit the drug factory. He instructs Chung to drop the two at a secluded area. On the way over, Hau Ko called Lap Man and told him that Laughin is an undercover cop. He instructs Lap Man to kill Laughin and tells Chung to watch the two.
It's Pak Kiu and Yuk Bo's wedding day. Pak Kiu goes to fetch the bride but before he can leave with the bride, he has to complete a game prepared by Sam Jie. The game requires him to go to the place where he first fall in love with Yuk Bo and find their engagement item. Coincidentally the place is the hill they covered when they were both on the E.U. trekking team - the same hill where Laughin and Lap Man is heading to.
Lap Man and Laughin reaches the an abandoned house where Hau Ko prepares a gun for Lap Man. Lap Man took the gun and struggles with Laughin with Chung watching from a distance. At the same time, Pak Kiu found the engagement item and heard a gun shot. He immediately rushed to the source of the sound.
Pak Kiu ambushed Chung from behind and steals his gun. He then sees Laughin pointing a gun at Lap Man. To defend his friend, Pak Kiu fires a shot at Laughin and wound him severely. Laughin lost his footing and roll down the hill. Lap man followed suit. Lap Man drives Laughin to the hospital, but Laughin may not make it. Laughin orders Lap Man to stop the car. He tells Lap Man to fire another shot at him and bring his body back to Hau Ko. That way, Lap Man will gain Hau Ko's trust and Laughin's death will not be in vain. Laughin also told Lap Man where to find his secret stash of diaries where Lap Man can find info about Chun Hing's dealings.
Lap Man brings Laughin's body back for Hau Ko and Hau Ko praises him for doing a good job. Sam Jie finds out about Laughin's death and is very disappointed and heartbroken. Hau Ko tells her it's all part of the "game".