Léon (1994)

Leon (Jean Renault) is a lonely professional killer who is hired. One day, the neighbor's little girl Matilda (Natalie Portman) knocked on his door and asked to avoid being killed there for a while. It turned out that the owner of the neighbor's house was the spy of the police drug enforcement unit, and he was punished by the evil police (Gary Oldman) for killing the whole family because of embezzlement of a small packet of drugs. Matilda was saved by Lyon, survived and stayed with Lyon. Lyon teaches the little girl to use the gun, she teaches Lyon French, and the two get closer and get along well with each other. The girl wanted to take revenge, but she was caught, and Lyon arrived in time to save the girl. The battle between good and evil mixed with grief and hatred is gradually escalating, and greater conflicts are inevitable.