Mathilda quickly discovers that Léon is a "cleaner", or hit man. She
begs him to take care of her and to teach her his skills as a cleaner. She wants to
avenge the murder of her four-year-old brother, telling Léon that he was the only one of her family she loved.
Léon shows her how to use guns, including a
scoped
rifle.
In return, she runs his
errands, cleans his apartment, and teaches him how to read. Several times Mathilda tells Léon "I love you", but he offers no response.