Looking for a yaoi manga

I read it a long time ago so I am a bit vague on the details, but it had to do with the uke getting revenge on the seme. The setting was of a royal or a ducal family, and the uke was living with another guy who was related to the seme as well, probably cousins or friends. The story was that the cousin's father had tormented the uke and his twin brother in the past due to which they brothers ended up seperated and the uke is looking for his twin. There was a case of mistaken identity as both the cousin and the seme are in love with the uke but the uke thinks they are in love with his twin brother. Anyone remembers the name?