Three days later, Cai Mingyu is back at his father's house. He's been looking through all the books in his study and can't figure out a way to get rid of the marriage contract. He asks his grandfather why he's back, and his grandfather tells him that he heard from his brother that he'd found a way. Cai tells his grandfather not to worry about it, because he can handle it. The duke's father comes in and tells Cai Mingyuan that he has something for the duke to talk about. Cai is confused, since he doesn't know how the duke got his hands on the secret letter. He tells the duke that the letter is his secret to the foreigners, and he hopes the duke will find the evidence and return his father to his innocence.