Ruse of Engagement

Japan terrorist NAOTAKE's meeting with the East Africa terrorists is not successful and they start a gunfight. Off duty police officer CHONG YAU-KIT discovers it but he stays calm. CHUNG YAT-KA, member of the Hong Kong Anti-Terrorist Force (ATF), learns that the gunfight at the shopping mall is related to the terrorists and she rushes to the place. ATF commander SHUM CHI-NGO asks YAU-KIT to provide information to them. YAU-KIT's mother TONG SUK-FAN is worried after learning about the case. YAU-KIT discovers his elder brother YAU-CHING fighting with others. YAU-CHING has become the gang leader BLACK DOG's subordinate. BLACK DOG receives an order from the East Africa terrorists to kill NAOTAKE and he asks YAU-CHING to carry out the task. When SUK-FAN is working, she is frightened to discover that YAU-CHING is trying to kill NAOTAKE. She stops him and she is sent to the hospital after the shock……

YAU-KIT finds YAU-CHING acting strangely and he tries to capture him but YAU-CHING escapes. On the other hand, the East Africa terrorists and BLACK DOG join hands together to rob the bank. YAU-CHING discovers a bomb inside the travel bag and he throws it into the river immediately. YAU-CHING and the others try to meet up with BLACK DOG. While following them, YAU-KIT is injured and being captured by the East Africa terrorist. The East Africa terrorists use the bank's decoder to perform illegal activities and YAU-CHING informs ATF. YAU-CHING is actually an undercover police of the Serious Crime Unit for monitoring BLACK DOG's activities. The incident is over and the brothers visit SUK-FAN at the hospital. SUK-FAN is relieved to learn about YAU-CHING's real identity. YAU-CHING plans to take leave but CHI-NGO invites him for a meeting. YAU-CHING meets YAT-KA and he is mesmerized by her beauty. CHI-NGO invites YAU-CHING to work for ATF.

YAU-KIT falls in love with YAT-KA at first sight. He learns that ATF is recruiting new members. With the support of ATF supervisor KO WAI and his elder brother YAU-CHING, his application is successful and he will be having a series of training with YAU-CHING in the camp. YAU-CHING is very arrogant for CHI-NGO has invited him to join the team personally. All classmates are dissatisfied. YAT-KA enters the camp to teach them computer hacking techniques. YAU-KIT is very nervous upon seeing her. YAU-CHING is very active and he dates YAT-KA by making use of Trojans. YAU-CHING wants to walk YAT-KA home but he is not successful. However, he discovers that YAT-KA comes from a rich family. When YAT-KA has left, YAU-CHING and YAU-KIT drink together but this is breaking the rules of the campsite. CHI-NGO discovers it and they are very worried for they will be punished...

In order to pursue YAT-KA, YAU-CHING and YAU-KIT are using different tactics. YAU-KIT waits patiently while YAU-CHING takes the initiative to date her. KO WAI learns that they might be expelled from the training camp and he warns YAU-CHING. With the help of the Public Relations Unit, Magazine reporter YIP TING comes to interview them and she gets to know YAU-CHING. In order to please YAT-KA, YAU-KIT decides to make a video with her photos. YAT-KA finds YAU-CHING interesting and she visits him. One of the trainees CHING-NAM has lost his love. YAU-CHING and the others accompany him to go drinking at the pub. In order to help others, YAU-KIT fights with the gangsters and he is arrested by the police. When everybody return, CHI-NGO punishes them and CHING-NAM is kicked out of ATF. YAU-CHING and YAU-KIT decide to negotiate with CHI-NGO.

After the incident, CHI-NGO tries to make the training even harder for them. YAU-CHING and YAU-KIT are trapped inside a freezer. They are then asked to clean the kennel. YAU-CHING feels that CHI-NGO is against him. YAU-KIT accidentally discovers that YAT-KA's ringing tone is the same as his video's background music and he misconceives that YAT-KA is interested in him. However, YAT-KA is actually interested in YAU-CHING. YAU-CHING returns home during holidays and SUK-FAN tries to remonstrate with him. YAU-CHING starts to examine himself. CHI-NGO allows CHING-NAM to return to the campsite. YAU-CHING and YAU-KIT change their perception on CHI-NGO completely. They decide to follow CHI-NGO's orders and they are determined to complete the training. When the team are waiting for their examination results from the ATF, they suddenly receive an order since the hiding place of some terrorists is discovered……

It is CHI-NGO's idea to invite the ATF trainees to join their work for he wants to give them a final test. In order to rescue the hostage, YAU-CHING and YAU-KIT ignore the instructions from their supervisor. After learning that this is actually a test arranged by CHI-NGO, YAU-CHING is very upset. He tries to negotiate with KO WAI and CHI-NGO but it doesn't work. YAU-CHING and YAU-KIT believe that the chance for admission to ATF is very low. All trainees gather at the ATF headquarters to wait for the result. YAU-CHING and YAU-KIT are selected eventually because CHI-NGO appreciates YAU-CHING's ability to make quick decision during critical situations. YAU-KIT is happy for he can work with YAT-KA in the future. YAN-MEI from the Intelligence Unit of ATF discovers that YAU-KIT is interested in YAT-KA and she encourages him. KO WAI overhears their conversation accidentally and he makes a decision.

An important witness in the South Korea terrorists case is being killed and this prevents ATF from carrying out further investigation. YAU-KIT is very upset. YAU-CHING and YAT-KA console him. ATF tries to investigate the immigration record of South Korea and they discover that a famous South Korea terrorist has came to Hong Kong. CHI-NGO believes that the terrorist is planning to kill a South Korea politician during the Korea farmers' protest. He asks YAU-CHING and WANG-LEUNG to follow the terrorist. YAU-CHING believes that YIP TING has contact with the terrorist. YIP TING successfully hides away from others during the transaction and returns to the publishing house. However, she is worried that the ATF will carry out investigation on her.

With the help of YAU-CHING, all the South Korea terrorists are captured by ATF. CHI-NGO is surprised that YAU-CHING has got some insider information of the South Korea terrorists but he did not question him. YAU-CHING meets up with YIP TING secretly. YIP TING provides information to YAU-CHING but she requires YAU-CHING to keep her identity a secret. YIP TING and KIM-HANG start a quarrel for EDMOND has betrayed the organization. KIM-HANG finally apologizes to YIP TING and they reconcile with each other. KIM-HANG decides to support YIP TING's decision to quit her job and study abroad. YAU-KIT insists to join the Intelligence Unit and he carries out investigation for ATF alone. He finally finds some useful information for the Intelligence Unit and he reports it to YAT-KA and CHI-NGO. YAU-CHING knows that YAU-KIT wants to join the Intelligence Unit and he promises to help him.