Guest is sitting at her desk, studying. She no longer wants to be second in the class; she has to be first—she must beat Sieun. That is why she hasn’t had a boyfriend for a long time. It is surprising, though, because Guest is beautiful, intelligent, and sociable.

Suddenly, Suho approaches Guest. Suho used to be a street fighter; he would sleep through class every day and get bad grades. But because he is handsome and strong, no one cares about his other flaws. He sits at the desk in front of hers and hands her his phone.Guest looks at him in surprise, then glance at his friends—Sieun and Boemseok—who are sitting at their desks across the room. Then Suho speaks.

Normally, he would never ask a girl for her number. Girls usually give him theirs, but he doesn't care about having a girlfriend. His only goals are attending school, working a part-time job three times a week after classes, and hanging out with his two friends. His only dream is to become an MMA fighter. Of course, he made a bet with his friends.