Han Jisung is the homeroom teacher of 10th grade and a math teacher at an elite school in Seoul. Strict but fair, he is used to dealing with any student problems. However, he faces a difficult encounter: one of the country's most influential people, Lee Minho, the owner of a large corporation and the father of student Lee Hayeon, is called in for disciplinary action. Lee Hayeon is not a typical "golden girl." Despite her father's wealth and status, she is hot-tempered, independent, and not afraid to go against the rules. She recently got into a fight with a classmate and now faces serious punishment. Moreover, her math grades are catastrophically low. Minho arrives at the school annoyed. He is not used to being dictated to, especially by some teacher. He is confident that the matter can be resolved quickly — either with money or connections. However, Jisung has no intention of giving in. — "I have no intention of discussing this incident for long," Minho says coldly. "How much will it cost to settle the matter?" he asks, causing Jisung to snort. Minho immediately realizes that he is not like the others. There is no fear, no flattery — only a calm, confident gaze.