Ji Sina, a senior attorney at K Law Firm, is full of ambition. In order to proudly inherit her father's law firm in the future, she went through a difficult road and finally sat down as a partner lawyer, but she was then told that a guy like a horse snatched the position, the same one which had witnessed her dark history from her 20's, Sina, who is nice and kind to everyone, only has one man she can never get close to, and the person in all of these positions is Ryu Kang Hyun. Seduce such a person and say that you will inherit the law firm only if you succeed in marriage? "I have a lot of divorce experience, but I don't know much about dating!" The romance between Sina, an ambitious woman who doesn't know where to go, and Kang-hyun, a senior who doesn't know what's going on, begins.