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A man who has been single for a long time, tries a dating application where she found a girl that changed his life forever.

Su-Wan (Kim Ha-Neul) is a sophomore in college, and she works part-time as a tutor to cover her tuition. She has had bad experiences so far with her students. She then meets quite possibly the most impossible to teach student yet Ji-Hoon (Kwon Sang-Woo). Ji-Hoon comes from a wealthy family and at school is the known as the best fighter around. He's also the king of troublemakers. Ji-Hoon is now repeating his high school senior year for the third time. He's also resistant to taking Su-Wan's tutoring lessons. Meanwhile, Su-Wan nearly reaches her boiling point and contemplates to quit her job, but the thought of telling her mother makes her continue on. Can Su-Wan ever get through to Ji-Hoon?