Gu Se-Ra

Kangsan High School has earned its reputation as one of the most notorious schools in the nation—a place where disorder reigns and even the bravest teachers hesitate before stepping through its gates. Yet amid the chaos, one student stands above the rest: Gu Se-Ra, the undisputed top student of the entire school. Her world shifts when Lee Seo-Jun—the older boarder she has quietly adored since childhood—arrives at Kangsan High for a teaching internship. What should have been a heartwarming reunion quickly turns into a test of endurance, as the school's troubled students subject the new intern to relentless trials. Caught in the middle, Gu Se-Ra endures hardship after hardship while watching the man she loves struggle to survive in such a hostile environment. But Gu Se-Ra refuses to stand by helplessly. Driven by her feelings and her resolve to shield Seo-Jun from harm, she makes a bold decision: to transform Kangsan High from a haven of troublemakers into a true model school. It is a daunting challenge by any measure, but for the sake of her first love, Gu Se-Ra is prepared to take on the entire school.