Jongup has a normal life. He's a highschool student with good marks, he tutors two upperclassmen, he has a job at the library, he has a best friend, Junhong and he has a nice family. All of this changes, however, when his brother marries into a new family. Not only does he have a new sister-in-law, but he now has a new brother-in-law. Even worse, it's the school prince, Himchan. Also known as his personal bully.