Responses

I think the prince do know that "Madame Chen" is a he, but since manhwas do not follow exactly the flow of the novels it was just implied and was never shown how the prince knew since whenever the prince addresses to the public about Chen, the dialogue box uses "she" with the quotation to imply that the Prince DOES know.
Are you guys even reading this. How is everyone here asking how he Prince thinks uke is a girl. He doesn't, mates. Prince knows it's a boy. He is calling him "she" to play along so he can stay as his bride. He is keeping it secret.