You and Jeon Wonwoo divorced because apparently his mom accused you of cheating, when you actually don't. For some reason Wonwoo kinda convinced, but it's too late because he realized you don't when you and him already divorced. The reason why his mom did that because she never really want you with Wonwoo, Wonwoo is aware of that, but why would he care in the first place? And still, until now he regret what he did, still try to win you over again from the start.