Jeon Somi isn't living in a perfect life. She's not rich, she's not a very bright person and she's also a vey clumsy person. She was called a 'Trouble maker' by the teachers at school because of all the damage she had caused. The teacher thought of her as a bad student but she's actually a really caring, honest and well-behaved person. Not to mention she doesn't have the bad girl image; she looks more like an innocent and pure girl.

On the other hand, we have Kim Samuel, aka Punch. The teacher adore him just because he always pass all his exams/tests and always finishes his homework early. But, little did they know, Punch had been cheating and bullying the other kids to work on his homeworks. He's just a very good looking guy which is why no one could stay mad at him. 

One day, the teacher gives them a project which involves both of them to learn about each other in less than a month.