One day, Jung Eun-chan was confessed to by Kwon Seo-yeon, a promising Taekwondo player in a slump. Due to his wide-ranging personality, he couldn't let go of his promising junior, and he promises to accept the confession if he wins the gold medal in the next competition. Turning a blind eye to her feelings, saying that it is a win-win relationship that helps each other, Eun-chan starts to accumulate actions that she will regret...