Don't Cry, Mommy(2012)
OVERVIEW
Yoo-lim, who divorced her husband and was preparing for a new start, learns that her daughter, Eun-ah, got raped by boys at school. However, they will not be punished because they are minors. Eun-ah kills herself, and Yoo-lim seeks revenge.
TAGLINE:
If they can't punish them, I will do it myself.