Yun Ga Min seems like a model student, but he attends Yuseong Technical High School, one of the worst schools to attend. Although he studies extremely hard, his grades don't improve in the slightest. Despite this, Yun Ga Min sits diligently at his desk with the goal of going to college. However, when his friends in the study group are bullied, Yun Ga Min takes off his glasses and his school uniform jacket to put his fighting skills to use. Lee Han Gyeong, Yun Ga Min’s teacher, dreams of seeing the school change for the better. Lee Han Gyeong tutored Yun Ga Min back in college and is reunited with him when she is appointed as a temporary teacher, while hiding a secret.