Su Ningxi is a cool girl. With her excellent grades, it is not difficult to get into the most important high school. However, she is not willing to do so. She insists on getting into a third-rate school without giving any more points. She almost made her grandfather so angry that he had a heart attack. He decided to threaten her with an engagement. Shengxi Noble School (the school where her parents were in love) , the two had no choice but to negotiate terms. She dressed up as a tomboy, entered the school, was late for the first day of class, and also met the campus prince No. 1 Yoon Ji-hyun (the best candidate for son-in-law in her family's heart). The two met like enemies and fought secretly like rare rivals, but they unknowingly developed a different kind of affection for each other...