An Ethics Lesson (Korean: 분노의 윤리학; RR: Bun-no-ui Yun-ni-hak; lit.

"The Ethics of Anger") is a 2013 South Korean mystery thriller film starring Lee Je-hoon, Cho Jin-woong, Kim Tae-hoon, Kwak Do-won and Moon So-ri.

[2] Written and directed by Park Myoung-rang, the crime thriller centers on four suspicious men involved in a college girl's murder.

Upon her death, the men in her life become aware of each other's existence.

A wire-tapping neighbor, a loan shark, her adulterous lover, and her righteous ex reveal their true nature, dragging all of them further down to the ruthless abyss.