Lee Ju-ha, the only daughter of a chaebol family, lives a happy life after marrying her ordinary husband Kim Gyu-jin. However, everything collapses after her parents are killed in a hit-and-run accident and she undergoes a heart transplant. As financial support is cut off, her husband and mother-in-law begin to treat her with contempt, and behind the successful beauty business she built, her husband's affair with investor Han Ye-ri is revealed. Betrayed despite trying to protect her family and pushed to the brink of losing everything, she meets Lee Yeon-seok while on the run. Despite a fateful attraction, she chooses revenge over love. To Yeon-seok, who confesses his love, she makes a proposal: seduce her husband's mistress. Will Ju-ha be able to punish Kim Gyu-jin and Han Ye-ri? A dangerous game of love and betrayal begins, heading toward ruin.