在这部誓不低头动作片中,香港特警队督察蓝朗（方中信饰）在侦察一宗重大罪案期间，冒死前去营救被黑社会绑架的女友（蒙嘉慧饰），却反遭陷害，被迫停职退出警界。朗只好在海边开设小餐厅，希望过平静的生活。可是黑社会势力并没有放过他。十年後，从澳洲回港的年轻人阿孝（陈宇琛饰）来到海鲜酒家工作，其父当年被蓝朗误杀，而阿孝正要来查明真凶。
Ten years after being drummed out of the police force for killing a friend and colleague who was corrupt, ex-cop Lam (Alex Fong) and his girlfriend Kelly (Yoyo Mung) have settled down to a quiet life running a restaurant in New Zealand - a quiet life about to be ripped apart when mob boss Mr. Dick (Eddy Ko) returns to settle old scores.
藍朗是警察還是古惑仔？？。这一生只为你。这不是警匪片，这是爱情片。方中信+蒙嘉慧。（無題）。
