Jang Byeong-tae is a small and weak boy living in Onyang in South Chungcheong Province. He's at the bottom of the school's social ladder and when he transfers to the neighboring Buyeo Agricultural High School, he faces an unexpected incident that becomes a turning point in his life.
In order to get a stalker from her past to stop harassing her, Kim Yeon Do posts a random photo she found online of a boy onto her social media profile and claims it is her boyfriend. However, the next day at school she comes to realize the photo she found was of the delinquent student in her school, Ji Hyun Ho. He becomes upset when he finds out as he does not know who she is and asks for an explanation from her. In order to make it up to him, she makes a deal that requires her to spend more time with him day after day. The more they spend time together the more they realize people have a lot more to them than meets the eye.