Shun liu ni liu
Tyler (Nicholas Tse) impregnates a lesbian cop, Ah Jo (Cathy Tsui),after a drunken night. He joins an unlicensed bodyguard service led by Uncle Ji (Anthony Wong), to earn money to give to Ah Jo who wants nothing to do with him. Nearly nine months later, Tyler meets up with a butcher named Jack (Wu Bai) and his pregnant wife, Ah Hui (Candy Lo), who helps Tyler, at Ah Hui's father's birthday, prevent the father's assassination. Tyler tries to convince Jack to start a bodyguard service with him, but Jack turns him down.
A group of South American mercenaries, known as the Angels, arrive and threaten Jack, who they call Juan, and their second in command Miguel (Couto Remotigue) offers him a chance to rejoin them if he kills his own father-in-law. Instead, Jack kills the leader of the Angels and evades Uncle Ji's bodyguards, knocking Tyler out in the process, and then steals a case full of cash from under their noses and escapes from the Angels. Jack drops his wife off at her father's mansion, giving her a key to a train station locker and telling her to go there when their child is born. Tyler is interrogated by the cops in connection with Jack, who accuse him of being connected to the killer because he saw him up close. Tyler tells them nothing.
An Jo tries unsuccessfully to parole Tyler, but Uncle Ji succeeds. Tyler thanks An Jo, and Uncle Ji locks him up in a transportation crate for a night before letting him out and getting Tyler to tell him about Jack. Uncle Ji gives Tyler more money, which Tyler tries to give to Ah Jo; he finds out that she has just gone into the hospital to give birth. Tyler heads off after Jack, and breaks into his apartment only to find the Angels and Jack have the place staked out.
A running gun battle ensues between Jack and the Angels as Tyler desperately tries to survive in Jack's apartment. Tyler ends up trapped in the apartment with the gas leaking and only manages to survive the explosion by hiding in the refrigerator. Jack tricks the Angels into killing one of their own and distracting them long enough so he and Tyler can escape the rest. Miguel admits defeat and tries to call a truce with Jack, but then calls it off when one of the other Angels spots Jack's wife who arrives on the scene to see her former apartment burning.
The Angels take off after An Hui, following her to the train station. Tyler steals a taxi with his fake gun, giving his wallet to the driver, who promptly takes it to the cops. The police, still suspicious of Tyler from earlier, place him at the scene of the gun battle and explosion send a SWAT team after him to the station. At the station, Tyler confronts An Hui with his fake gun and takes the money Jack stole from the Angels. An Hui goes into labor and one of the Angels shoots a cop, and an innocent, while trying to shoot Tyler.
In the ensuing panic, Tyler drags An Hui off to safety and the SWAT team arrives to deal with the situation. As they send in a medic team to retrieve An Hui, the Angels open fire on them. Jack arrives on the scene just before the SWAT team, including Miguel and other disguised Angels, starts a full invasion with tear gas. In the midst of the gases, Jack, the Angels, and the SWAT team hunt one another, with SWAT officers silently killed one by one by the Angels, who then disguise themselves in the SWAT gear from the fallen officers, enabling them to kill even more unsuspecting officers. Tyler escapes with An Hui to the railway tracks, where Jack saves the life of the SWAT team lieutenant and surrenders to him.
The remaining Angels escape through a tunnel to a stadium full of concert goers. Tyler has to hunker down in the tunnels as An Hui starts to give birth, and Jack convinces the SWAT Lieutenant to let him go after Miguel in the stadium. Jack confronts Miguel in the catwalks above the concert goers and defeats him. Meanwhile, Tyler helps An Hui successfully give birth before the last of the Angels shows up. A fight ensues, and just as Tyler is about to lose, the last of the Angels gets shot repeatedly by An Hui.
Jack is given a head start to escape the police and visits with his wife, and Tyler recovers the money before going off to the hospital to see his child.
violence, murder, romantic