While on holiday, Jihyun pretends to be an entirely different person and actually meets her dream guy. However, when she transfers to her new school for senior year, she bumps into her 'dream guy' and it seems like she weren't the only one pretending: her gentle and caring angel has turned into a bratty arrogant jerk!

The only way for Choi Minhye to get out of her arranged marriage is to show her parents a perfect boyfriend that she loves and would rather marry. Frustrated with the lack of options, Minhye eventually selects the school nerd, Jung Daehyun, striking a deal with him to transform him into the perfect man.  

Jaehee, a poor girl, mistaken for a boy, is recruited by Ljoe to swap places with him in school so that he can live his life the way he wants. Starting with lessons on how to act like Ljoe, Ljoe slowly grows an attachment to this 'boy' that confuses even himself.