Joo Jaekyung, son of Tae Kyung Group, a famous tycoon. His parents want him to become a celebrity or a successor to a real estate corporation, because his mother is a president of an entertainment corporation that trains Kpop idols and his father is a president of a real estate corporation. But he had a dream of becoming a boxer even though his father did not support it.

Even though he's a Chaebol, he's not like everyone else, he has a hobby of One Night Stand, exactly one night because he doesn't make love a second time with the same person no matter how great they are.

After a summer vacation, today he returned to school, Gaedong University. The mother of one of his Chaebol friends is the president of this university, so Chaebols are very favored in this school.

When he and his Chaebol friends were sitting in class and sitting in the last row, suddenly a loud noise made everyone in the class turn toward the door. A girl fell at the door. Because you were late, you ran quickly into class without being careful of the steps.