Is it wrong that I envy you? Don't I want to look pretty too? Who stole Cassie's body? Is there still love for me? As well as many other questions in Carren's head. A beautiful woman who loves her twin sister very much, but that was then. Prior to the tragedy, a fire in their home caused him to become a victim of that incident. Like the story in the fairy tale Princess Goose. Her twin sister named Cassie grew up beautiful like Princess Swan who was admired by many princes out there. What about Carren? Of course everyone can guess. Yes, he is the figure of the Ugly Duck. Will any luck befall him? Can he switch places with his brother? Even before the fire happened to him, the two of them had always been extraordinary figures. So why does fate seem to be playing a toy on him? People now always compared the two of them, causing the previously cheerful Carren to become a quiet person and didn't want to see people anymore. Envy, revenge, envy and disapproval of the circumstances that befell him, made Carren make a very fatal mistake in his life. Will Carren still be able to finish everything? Will be delivered in this 'TRAITOR' brotherhood story….