PO (Lam Bowie), a sergeant of Organized Crime Bureau, was taken away from his position. He decided to join his friend KIT’s (Cheung Siu Fai, Eddie) security guard company. A millionaire NAM (Tsang Kwong) appreciated PO very much and appointed him to be his son JOE’s (Ma Chun Wai, Steven) bodyguard. The character of PO and JOE was totally different, they could not get along well. However, friendship was gradually built up as time went by. Meanwhile, JOE fell in love with LAM (Wu Qi Li, Elain), daughter of his father’s old friend. On the other hand, LAM had intimate feelings towards PO. KIT’s sister FONG (Chan Miu Ying, Mariane), who admired PO secretly for years realized that. She therefore tried to bring JOE and LAM together by all means. In order to investigate who was the murderer of his wife WAI (Pang Chi Ching), PO deliberately chased after YUK (Cheong Wei Yee, Angie) to get the truth. Unexpectedly, he was in love with her. JOE and NAM were kidnapped. PO knew that these kidnappers were related to WAI’s death. He swore that he had to fight against them. In the utmost danger, PO found that he was being betrayed by somebody…