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When the top student suddenly needs to teach the famous playboy in their school.

Choi yena, a well known top student not only because of her excellent result but also because of her attitude as a cheerful person. Yena was living her perfect life when suddenly she needs to teach Ji Changmin the most popular playboy in her school to get a good result to pass the examination.

What will happen to yena life after meeting with Changmin?

p/s: I'm sorry if there is any grammar mistake because of english, not my first language.