Do Yoonshin is a lawyer who defends the weak and powerless. Justice was his brand. One day, his elder sister convinces him to join Doguk, one of the nation's largest law firm, as an associate partner. He ends up working as an associate lawyer under Kang Sehun: he's an aggressive man who desires victory in his cases even if he has to use underhanded methods.
Finding their outlook in life, Yoonshin and Sehun end up clashing.
The robust Yoonshin would always adhere to common sense, where as Sehun would doubt Yoonshin's competence as a lawyer. But perhaps a little spark is needed to overcome the barriers, causing Sehun to open his cold heart little by little.