Michelle (Christy Chung), the only eyewitness to a murder case in Hong Kong, is being hunted by a killer because her fiancé is a wealthy businessman with close ties to the mainland's top leaders. The extraordinary Chinese special police Xu Zhengyang (Jet Li) is assigned by the central government to Hong Kong to protect Michelle. The two were disgusted with each other when they first met, but gradually discovered each other's strengths and developed feelings. However, due to his identity and the nature of his work, Xu Zhengyang tried his best to suppress his feelings, but he could not avoid the gains and losses when he deliberately avoided them. Just when the two felt that they had no choice, an extremely dangerous killer quietly approached them.