Lady Vengeance (2005)

After being wrongfully imprisoned for thirteen years and having her child taken away from her, a woman seeks revenge through increasingly brutal means.

Wrongfully accused of child abduction and murder, the angelic-faced single mother, Lee Geum-ja, is released from prison after thirteen long years. Hell-bent on taking her sweet revenge on the man behind the hideous crime, Lee hatches an infallible plan of retribution with the help of her cellmates; however, planning is easier than doing. Now--as Lee Geum-ja struggles to make amends with the daughter she was forced to give up--at the same time, she finds herself torn between her insatiable thirst for vengeance and the desperate need for atonement. Can she have both? - Nick Riganas

After a thirteen-year imprisonment for the kidnap and murder of a six-year-old boy, Guem-Ja Lee starts seeking revenge on the man who was really responsible for the boy's death. With the help of fellow inmates and reunited with her daughter, she gets closer and closer to her goal. But will her actions lead to the relief she seeks? - Spekkie Big