Sympathy For Lady Vengeance 親切的金子 (2005) (Region A Blu-ray) (English Subtitled) Korean Movie

Geum-ja, a beautiful girl who cannot help but draw the attention  of all the men around her, was first introduced to the public as the one responsible for the abduction and murder of a little boy at the age of twenty. Being so young and pretty, her horrific crime drew national media attention. But now, 13 years have passed and in that time, Geum-ja has been the most hardworking and model prisoner, earning the nickname "sweet" Geum-ja. "Sweet" Geum-ja, however, has not been idle during her time in prison. For 13 years, she plotted revenge against her former teacher, Mr. Baek. Her kindness while in prison has paid off and has now gained many friends and allies. Now that Geum-ja is getting out of jail, she is ready to put her carefully conceived plan into action. What happened between Geum-ja and her teacher 13 years ago? Why does she want revenge? And how will her quest for vengeance end?