Counter Crush

One day, Eun-Chan Jung receives a confession from Seo-Yeon Kwon, a promising junior in Taekwondo who is in a slump. Because of his meddlesome personality, he cannot just ignore the promising junior, so he promises to accept her confession if she wins a gold medal in the next competition. Eun-Chan ignores his feelings, saying that it is a win-win relationship that helps both sides, and begins to pile up actions that he will regret more and more…

(Source: Bomtoon, translated)