Sixteen-year-old Oh Hayoung has always got what she wanted and lives a pampered life in her L.A. world. Hayoung can't escape the mounting frustration she feels with her family situation and she makes sure everyone knows it. After an over-the-top prank pushes her father one step too far, Hayoung is shipped off to Korean girl boarding school, Acube High School. Finding herself in a foreign world of early curfews, stern matrons, and mandatory lacrosse, the American princess has finally met her match: a school of Korean girls who won't tolerate her rebellious ways, surrounded by a new circle of friends, Chorong, Bomi, Eunji, Naeun, Youkyung, and Namjoo. Hayoung begrudgingly realises her bad-girl behavior will only get her so far. And unwilling to accept the strict regime, she decides to misbehave and take the blame for everyone until she's dismissed. The school only appealing feature for her is Headmistress dashing son, Sehun. When the dream prince become closer to her and her new bad-girls friends keep helping her to do her way, that changes everything.