Geum Jan-di, the daughter of a laundry shop owner, is a sophomore swimmer at a public high school that doesn't even have a swimming pool. Despite the dramatic circumstances surrounding her, Jan-di lives with resilience. One day, an unexpected event occurs, and subsequently, Jan-di is scouted to attend Myth High School, an elite private institution attended by only 1% of Korean students. The Four Great Wealths (F4), four handsome sons of major conglomerates, rule this school with an iron fist. To them, Jan-di is like a weed sprouting in a meticulously maintained garden, and they instruct their classmates to ostracize her.
In response to the red card issued by the F4, Jan-di not only refuses to yield but also declares war on the F4.
"You're the second girl I've ever seen like this!" In the eyes of Gu Jun-pyo, the heir to the global conglomerate Myth Group, Jan-di's fearlessness in standing up to the school bully reminds him of his sister, who he respects more than his parents—a "wild girl."
Jun-pyo takes Jan-di to his house and painstakingly informs her of his intention to secretly date her. But how can Jan-di accept this? Her heart has already fled to the emergency staircase, a private sanctuary belonging to Yoon Ji-ho, the grandson of a former president and the closest friend among the F4 to Jun-pyo.
Ji-ho follows top model Min Soo-hyun to France, his childhood first love. Meanwhile, despite their constant bickering, Jun-pyo and Jan-di begin to understand each other implicitly. Their dates soon face strong interference from Jun-pyo's mother, President Kang, testing their love once again.
President Kang is a cold-blooded operator who shows no mercy when it comes to family honor and the safety of the group, treating her children as tools for use. As President Kang's "claws" extend to Jan-di's surroundings, Jun-pyo wavers, and at this time, Ji-ho, back in Korea, stands guard beside Jan-di...