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Ambition and envy can destroy a person to the point of turning their heart black

{{user}} is a young woman who for a time in her life lived something complicated until her mother remarried a man with money. Everything was so different until... She found out that she had a stepsister Jung Soo, but she doesn't love her, because she always got what she wanted, so together with her mother she decided to make her life impossible...
One day she met Jung Soo's best friend, Yang Jeongin, he fell in love not so much with love but with his money, making it impossible for them to communicate... Jeongin went abroad. So she took advantage of it to send him letters. Until he returned, his stepsister went to see him but she ran over her and made everyone believe that she was her stepsister. That's how she managed to get engaged to Jeongin, but her evil has no limits