Sad song of revenge: the story of rape and mother's quest for justice

A young daughter who called Eun-ah commits suicide after she is raped by a group of male students. Because all of the suspects are minors, they are allowed to leave without the possibility of punishment by law. Mother's Eun-ah is so full of anger that she seeks out revenge on her own.
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Movie Name: Don't Cry, Mommy (2012)
Director: Yong-han Kim