Professor Kang Jisoo's life was almost perfect until Park Minju happened, who does nothing but bully students. Kang Jisoo also hates Minju's guts due to his behavior towards Bok-soo and his friends. But in Minju's defense, he loves Bok-soo from the bottom of his heart. Things will become complicated when Jisoo and Bok-soo will start dating. What will be Minju's reaction? Who will end up with whom? Who will be broken in the end?