The Killer 1989

Ah Jong, a hitman, decides to retire after one final job. During a shootout with gangsters, he accidentally blinds a young nightclub singer named Jennie when his gun fires too close to her eyes. Over the next six months, he quietly watches over her, attending all of her performances. One night, he intervenes to save her from being mugged and assaulted; Jennie then invites him into her apartment. They grow close and begin a relationship. However, Jennie then learns from her doctor that if she does not undergo a corneal transplant, she will lose what remains of her sight. Ah Jong agrees to kill a high-ranking triad boss to pay for the operation.
Meanwhile, Detective Li Ying performs a botched undercover sting but is scolded and demoted by his superior for shooting his enemy inside the tram and unintentionally causing the fatal heart attack of a hostage. Li later spots Ah Jong in the middle of the hit on the Triad boss, but eventually loses him. Ah Jong's client, Wong Hoi, betrays him by sending hitmen to kill Ah Jong at the location of his getaway car. Ah Jong guns down the hitmen, but a child is badly injured in the crossfire. Ah Jong rushes the child to a nearby hospital while being followed by Li and his partner, Sgt. Tsang Yeh. Ah Jong holds Yeh at gunpoint until the child regains consciousness, then escapes from the police. Li becomes obsessed with Ah Jong's act of goodwill. He and Tsang learn about Jennie; when Ah Jong visits her, he manages to outwit and elude the two cops once again.
Li and Tsang explain to Jennie that Ah Jong was the assassin that blinded her at the nightclub. Ah Jong meets with his manager, Fung Sei, and demands the money he was promised for his last job. Sei betrays him by giving him a briefcase of blank notes and sends hitmen to take down Ah Jong in his own home. Ah Jong kills his attackers, but spares Sei out of loyalty. The next day, Ah Jong attempts to kill Wong Hoi in a drive-by shooting but fails. Wong Hoi hires hitman Frank Chen, to kill Ah Jong. Jennie is persuaded to help the police set a trap for Ah Jong at the airport, but Sei distracts them while Ah Jong flees with Jennie. Tsang follows Sei to his house, where Ah Jong and Jennie are hiding, but gets fatally wounded by Chen's gang and dies in the hospital moments after sharing his discovery with Li.
Li goes to arrest Ah Jong, but winds up helping him, and Jennie fight their way out of an ambush. Ah Jong and Li flee, and while Ah Jong's wounds are mended, they find themselves bonding and becoming friends. Ah Jong makes Li promise that should anything happen to him, he will make sure that Jennie has her operation. Li, Ah Jong, and Jennie take refuge in a church while Sei goes to get Ah Jong's money from Hoi. He is badly beaten after trying to shoot Hoi and sustains several mortal gunshot wounds, but manages to get the money to the church. Ah Jong shoots Sei to end his suffering, and he and Li arm themselves before engaging in a bloody shootout with dozens of gangsters.
Li and Ah Jong are wounded, and eventually find themselves in a Mexican standoff between Ah Jong, Li, and Hoi. Hoi holds a gun to Jennie's head and shoots Chen dead when Li takes him hostage. Ah Jong has his eyes shot out, and bleeds to death as Jennie, now completely blind, crawls around helplessly trying to find him. As the police arrive, Hoi immediately surrenders, but an enraged Li kills him promptly during the process of his arrest. In the end, for disobeying the law by murdering Hoi even after he had surrendered, Li is surrounded by the police, and collapses to the ground in despair at the loss of his friend.