Armed Reaction - Armed Reaction III

A year later, Chan Siu Sang is single and all alone; his old love, Chu So Ngo, married the doctor who treated her son and left the police force. Then, he meets Wai Ying Zi, a rookie police officer who is under the Chan Sam Yuen Police Traffic Department unit. The two get off on the wrong foot due to misunderstandings. Wai Ying Zi, who is eager to show off her skills, seems to get into a lot of trouble. She is deemed reckless and rash. Later on, Ying Zi joins Siu Sang's CID unit, which leads to the two bickering Non-stop. After Siu Sang saves Ying Zi's life during one of their investigations, she learns to respect him, and the two become friends.

Chan Sam Yuen is promoted to the head of the Police Traffic Department. She and Ching Fung are also now parents to a pair of girl/boy twins, but their marriage is not as happy as it seems as the two continue to have quarrels in their marriage. With marital problems at home, Sam Yuen becomes a cold, unreasonable and mean boss at work.