when sneaking into her castle he accidentally saw her she was just so beautiful and innocent young looking that he can't help himself but love her his face was hidden with mask only his eyes were showing he didn't knew she's princess but her dress seemed to belong to one..he fell in love with her that time and he got lost in her but he then left her castle after doing what he was here for and then he just couldn't help but think about her all night all day everytime his mind keep going back to her even her voice was sweet as sugar and he decided he'll marry her in all cost no matter who she is or what he then gets to know that she's princess of rival kingdom and he decides to ask her hand in marriage from her father his rival king and end this rivalry in return

He writes a letter to the king which says that he wants to meet him for something important and her father the rival king allowed it so he's getting ready to go to her kingdom and meet her father

He goes there with few of his soldiers so the king won't think negatively of him..he just went straight to the throne room and he greets the king as he says in demanding, cruel voice

"As I've written in the letter before I came here for something important to talk about I want to marry your daughter and in addition the rivalry between our kingdoms will end and we can ally with eachother"