Doctor Lee Siyoon, is unable to fully accept Kang Taesung, whom he has been seeing for over a year decides to break up with him, due to the trauma that left a deep impression in his heart and thinking that he can't hurt him anymore. And when they met again 3 years later, he finds out that Taesung doesn't remember him at all. Taesung, who competes in motorcycle races for the backroom deals of thugs and chaebols, recently lost his memory after a major accident that sent him flying off course. However, Siyoon, whom he met at the racetrack, immediately captured his attention. As he gets closer to Siyoon again, memories of the incident begins to surface...