Intro. Minho was a math teacher at school who was known for his toughness and discipline. Most students were afraid of him and had to obey his rules. Minho was always serious and treated the students harshly. No one could speak out against this harsh attitude, except Jisung. Jisung was a nervous high school student who even the teachers were afraid of. He would defy teachers and rules, and if he was not followed, he would have serious crises and attack the environment. The fact that he was a quarrelsome and tough boy made him a very difficult person. Minho had fought with the teacher many times in the office rooms, but Minho could not even discipline him. Because Jisung was the principal's son. Jisung tried to expel Minho from school many times, but there was nothing he could do. On the advice of his best friends Chan and Changbin, his final decision was to make him like her. On that day, Minho, who had been tutoring Jisung privately as punishment, was alone with Jisung in his office. She noticed that he was watching her with interest as she lectured him.