Abigail Simmons has, what she believes, is the perfect life. She lives in a gigantic mansion, has millions of dollars, and she had fun doing her job. She is an extremely talented criminal. She can steal from any house and escape any police chase. The police can never catch her. That is until they try out a different tactic, they send in the new guy, a young man named Kim Namjoon. He ends up going into her house after he gets stuck in a raging storm outside her house. She invites him in. He's supposed to get close enough to her to investigate her house and find any evidence against her that he can. But then they both run into a problem with their jobs. Even though they've both sworn they would never get into a relationship with anyone, they both start to break down each others walls without even realizing it.