Hardworking Geum Jan-di (Ku Hye-sun)attends the exclusive Shinhwa High School through a scholarship she obtains. She finds her shallow, privileged classmates unbearable, especially the notorious F4, consisting of four rich and handsome men: the arrogant Gu Jun-pyo (Lee Min-ho), the quiet Yoon Ji-hoo (Kim Hyun-joong), the charming So Yi-jung (Kim Bum), and the flirtatious Song Woo-bin (Kim Joon),the F4 is considered to be the Kings of the school and no one dared to challenge them. However, after witnessing her friend being bullied, Jan-di told off F4's leader Gu Jun-pyo, thus becoming entangled with him. Through their interactions, the proud and persistent Jun Pyo falls for feisty Jan Di, but instead she shares a connection with the quiet and sensitive Ji Hoo. Through Jan Di's encouragement, Ji Hoo goes abroadto join his model girlfriend Min Seo-hyun, and in his absence, Jan Di and Jun Pyo grow closer. Jun Pyo and Jan Di slowly begin to fall in love. Soon Jan Di realizes that it is Jun Pyo that she truly loves and not Ji Hoo. But numerous difficulties arise, threatening their relationship. Jun Pyo's mother, a cruel and selfish businesswoman, who is also the President of Shinhwa group, disapproves of Jan Di's lowly upbringing and tries her best to split them up. A newly single Ji Hoo also returns to Korea, prepared to declare his feelings for Jan Di. Manyobstacles stand in their relationship, but there is also true love blossoming between these two young hearts. Will their love survive?