When HEUNG WING meets up with the drug dealer, Senior Inspector WAI SAI-LOK comes to arrest them but HEUNG WING escapes successfully. SAI-LOK discovers from his boss that HEUNG WING is an undercover police from the Narcotics Bureau. HEUNG WING tries to mingle with the drug dealers by pretending to be a drug maker. HEUNG WING’s subordinates HO KWAI, NIN YAU-FU and CHENG CHI-SHING help to take care of his family while he is carrying out duties. After arriving at the divan, HEUNG WING discovers that the most wanted man LEE BING-LUNG is the owner of the drug factory. Representing the Intelligence Unit of the Narcotics Bureau, SAI-LOK waits outside the drug factory with colleagues from the Operations Unit. SAI-LOK decides to utilize CHAN KA-PIK’s home as a temporary control centre for further investigation and he urges KA-PIK’s younger brother KA-CHUN to let them in. KA-PIK and her good friend NG TAK-TIM return home to collect some goods……

BING-LUNG sends HEUNG WING to the illegal clinic for treatments. SAI-LOK asks the new staff HEI-SUEN to inspect the market. HEI-SUEN feels that SAI-LOK is making fun of her and she feels dissatisfied. SAI-LOK discovers that HOK-LAI’s team is following them and he asks his subordinate to offer coffee to HOK-LAI. HEUNG WING wakes up and tells BING-LUNG that he will start making drugs. BING-LUNG brings HEUNG WING to chase after the informer. HOK-LAI’s team arrives and starts a gunfight with BING-LUNG. KA-PIK receives a call from her good friend JENNY during work. KA-PIK discovers that JENNY is taking drugs and she rushes to find her. She discovers JENNY losing control and jumps down from the bridge. KA-PIK mourns for her by burning offerings at the bridge. SAI-LOK invites KA-PIK to be his snitch. He asks HEI-SUEN and KA-PIK to buy drugs from CHAN KIN. CHAN KIN finds HEI-SUEN unfamiliar and he asks her to take drugs on the spot.

CHAN KIN returns home and is attacked by three masked men. In order to protect himself, CHAN KIN asks HO KWAI and the others to protect him. HEUNG WING knows that BING-LUNG wants to kill him and he tries to slow down the drug-making process. In order to find out the whereabouts of the black money from drug trafficking, WING-TUNG from the Financial Investigation Unit opens an account in the securities company by pretending to be a rich woman Mrs CHIN. WING-TUNG asks SAI-LOK to monitor TSU WING-MAU closely and SAI-LOK discovers that WING-TUNG and HEI-SUEN are cousins. After meeting with HEUNG WING, the big boss asks BING-LUNG to kill HEUNG WING afterwards. After finishing BING-LUNG’s case, HOK-LAI is transferred to the Narcotics Bureau and he becomes HEUNG WING’s team leader. The police discover that the South America drug dealers are trading with Hong Kong’s drug dealers……

SAI-LOK asks HEI-SUEN to attend KWOK-TUNG’s mother’s birthday banquet together. HEI-SUEN is shocked to discover many gangsters from the triad society there. HEI-SUEN finds SAI-LOK mingling with the gangsters naturally and she believes that he is acting against the police’s code of conducts. HEUNG WING persuades LAU FOOK to be an informer again and LAU FOOK hesitates. LAU FOOK asks SAM-KAU to meet him in the prison and SAM-KAU assures him that he can work in his seafood restaurant after releasing from jail. During the hearing of CHAN KIN’s case, KA-PIK is overjoyed to learn that CHAN KIN’s sentence is not heavy. CHAN KIN is shocked to realize that KA-PIK is his daughter. HEI-SUEN visits KA-PIK and KA-CHUN’s epilepsy is bothering him again. The doctor says that there is a new medicine to treat his illness but the cost is very high. KA-PIK is worried and she doesn’t know what to do. HOK-LAI and SAI-LOK do not coordinate with each other……

While KA-PIK is tailing after SAM-KAU and the others, TAK-TIM suddenly arrives and her plan is almost ruined. SAM-KAU discovers that one of his followers is stealing his drugs for sale and he punishes him fiercely. LAU FOOK is startled to witness it. KA-PIK discovers LAU FOOK meeting with HO KWAI and she realizes that he is also a snitch. LAU FOOK wants to withdraw from his work but HOK-LAI forces him to carry on with both hard and soft tactics. SAI-LOK goes to Macau alone to rescue KWOK-TUNG’s son. HEI-SUEN finds SAI-LOK staying with KWOK-TUNG and she suspects that they have special relationship. WING-TUNG helps HEUNG WING to pick up their son from school since HEUNG WING is busy. WING-TUNG’s boyfriend CHEUK-LUN suggests her to fight for the custody of her son. HEI-SUEN follows SAI-LOK secretly and she discovers SAI-LOK meeting up with SAM-KAU through KWOK-TUNG……