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Former tennis pro Lee Goon had his career cut short by a devastating injury, plunging him into despair. Desperate for relief, he turns to a psychiatric tool called the "memory eraser," which allows him to reset his life and regain his confidence. However, the tool plants false memories in Goon's mind, making him believe that his psychiatrist, Kyung Joo Yeon, is his first love. Will meddling with memories lead Goon and Joo Yeon into further trouble, or will it inadvertently spark a lasting romance?