Sonnam is one of the top private schools in Seoul, renowned for its elite students and the children of the city’s most influential figures. However, everything changes when two best friends, Lisa and Chaeyoung, transfer there. No one knows what secrets lie behind its walls. What connects the school’s "queen", Kim Jisoo, and Jeon Jungkook, who just returned from America? And what do the cold-hearted new student, Min Yoongi, and Kim Jennie — whose family recently went bankrupt — have in common?