Oh Soo-Jae (Seo Hyun-Jin) is a lawyer, talented enough to become the youngest partner at TK Law Firm. The law firm is widely considered as the best in South Korea. Oh Soo-Jae is driven by her desire to win cases and also her self-righteous principles. She has lived her life to achieve success, but she gets involved in an unexpected case and she gets demoted to work as an adjunct professor at a law school. At the law school, Oh Soo-Jae meets Gong Chan (Hwang In-Yeop). He is a student there. Gong Chan has experienced a painful past, but he still has a warm heart. He falls in love with Oh Soo-Jae and he would do anything for her. Meanwhile, Choi Tae-Kook (Heo Jun-Ho) is the chairman of TK Law Firm. He would do anything to satisfy his desires, even if it's illegal or immoral.