Former professional tennis player Lee Goon saw his career cut short by a devastating injury, which plunged him into despair. Desperate for a release, he turns to a psychiatric device called the "memory sterilizer," which allows him to reset his life and regain his confidence. However, the device plants false memories in Goon's mind, making him believe that his psychiatrist, Kyung Joo Yeon, is his first love. Will the mix-up with the memories lead to even more problems for Goon and Joo Yeon, or will it inadvertently spark a lasting romance?