Dog Bite Dog

来自柬埔寨的鹏（陈冠希饰），自少被送到黑市拳馆厮杀生存，个性好勇斗狠，像野兽般的残暴；出身香港的重案组探员伟（李璨琛饰），行事偏激，不听指挥，投入查案时的蛮劲像头野兽。

　　一兵一贼各走极端，却因为一宗法官太太被买凶谋杀案而碰头，二人互相追捕互相角力，更以暴易暴，伟的同僚逐一被鹏所杀，伟的怒火怨恨燃至沸点，狗咬狗般的厮杀一发不可收拾……

"Only a beast can smell the tracks of its own kind."

Pang Jr., a young killer from Cambodia, arrived Hong Kong to assassinate. At the same time, cop Sam and his team of detectives got their orders to investigate the crime. Wai soon found Pang with his intuition and started pursuit. Terrified, Pang fled to a refuse dump in the countryside, where he accidentally met Yue. Yue was raped by her step- father. Pang killed her step-father and promised Yue that he would take her to Cambodia and start a new and happy life together.

By this time, Wai and his colleagues tracked down the couple. Pang, like an injured beast, and killed Wai's colleagues one by one and escaped to Cambodia. Wai swear that he would kill Pang himself even if they were at the ends of the Earth. The two men became like two wild dogs to attack each other, neither one wanting to stop until the other side fell!