Former professional tennis player Lee Joon saw his career end due to a devastating injury that left him feeling hopeless. In a desperate attempt to find relief, he turns to a psychological tool called a “memory eraser,” which allows him to reset his life and regain his self-confidence. However, the tool implants false memories in Goon’s mind, making him believe that his psychiatrist, Kyung Joo Yeon, is his first love. Will meddling with his memories lead Goon and Joo Yeon into more trouble or inadvertently spark a long-term romance?