"I'll do this marriage." Woo So-ran, a dedicated lawyer, is the only person who's aware of Baek Kang-ho's contract. She agreed to marry him instead of his runaway bride. “You'll regret it.” Well, I don't make decisions which I’ll regret in the first place. She entered the tiger's den with confidence. Even though her life has been quiet and boring so far, a messy and secret romance begins. Will I regret this marriage?