City On Fire 1987

Ko Chow (Chow Yun Fat) is a police undercover agent who is torn between his duty as a police officer and his loyalty to his friends on the wrong side of the law. He wants out and his commander officer Inspector Lau (Sun Yueh) reluctantly approves his resignation but gives him his last assignment - supplying guns to a gang at criminals suspected of armed robbery. Tigers (Danny Lee) heads the gang of robbers. He has built a relationship with Ko Chow based on mutual trust and respect. During the final shoot out with the police, he is equally tom when Ko Chow sacrificed himself to save him and simultaneously revealed his true identity.