First it was 6 minutes short drama not 10 minutes as written in synopsis. Girl send by her brother to the prince to take the revenge from him as her family and his family are enemy. She did what her brother was telling her to do by sending messages through pigeon and about this prince knew but he was confused that his wife was real thing him as enemy or she was innocent and she was forced to or really she was cunning on the other side she also thought that he is her family's enemy or he is a good person.
Basically it was just a cliché