Introduction: At 27, Yoon Harin meets her end in the flames—betrayed and nearly murdered by her husband, Kang Siwoo. But when she opens her eyes, she finds herself back in her high school days. With the resentment and thirst for revenge from the brink of death still burning inside her, Harin vows never to fall victim again in this life. Yet the Siwoo of the past still stands before her, and unexpected events—different from her previous life—begin to unfold one after another. Harin becomes entangled in the school’s power dynamics, Siwoo’s ex-girlfriend Jung Sera, and the enigmatic Seo Jihoon, all while navigating constant conflicts and psychological battles. What began as a calculated move for revenge slowly wavers as Harin learns the hidden truths and genuine feelings behind Siwoo’s actions. Will she repeat the tragedy of her past life, or will she create a new ending? Harin’s choice will determine both of their fates.