For a little sister of a kingka, Lee Sena is totally different from his brother. She is the cold girl at school, unlike her brother, Lee Sungyeol. Although shes cold, theres one characteristic that doesnt suits her. "Shes soo cute" was all the boys at her high school said if they see her. Many boys wants her but she always ignores them. If they force, her bestfriend or her only friend, Jeon Jungkook will always be by her side to help her. All of her classmates envy her because shes the smartest in class and her bestfriend was a handsome kingka, to be exact. One day, a new student came and quickly became a kingka because of his looks and talent. His bestfriend told him about everything including about Sena. And, his bestfriend dared him to melt that girls heart. His bestfriend gave a very strict warning which is "She has a stone heart". Can this boy melt Sena's heart?