Mother

A mother lives quietly with her son. One day, a girl is brutally killed, and the boy is charged with the murder. Now, it's his mother's mission to prove him innocent.
Director: Bong Joon-ho.
Starring: Kim Hye-ja, Won Bin, Jin Goo, Yoon Je-moon, Jeon Mi-seon, Chun Woo-hee and more.