A sweet revenge caused by misunderstandings begins! In an unfamiliar lecture room after class registration, Yuna bumps into Jungwoo (who looks just like her best friend Jisoo's playboy ex-boyfriend!) and they kiss in an unexpected accident. After a misunderstanding, Jungwoo suddenly declares, “I'Il date you," and Yuna plans a grand revenge by 'seducing and dumping!’