Two Twin Princesses, Jeon YoonWoo known as Yoon and Jeon YeonWoo known as Yeon. Yoon and Yeon is the opposite. Yoon is the evil Princess while Yeon is the good Princess of the Royal Family. Jeon WonWoo, their brother whom always on Yoon's side, knew what made Yoon evil. There's a story of how Yoon can be the demon of the Royal Family. But as soon as Kim MinGyu, a friend of their brother, also his bandmate, came into Yoon's life, Yoon started to become even more evil. But at the same time, she got confuse with herself when she started to help people in need. "Why do you have to be evil Yoon-ah?" "None of your business MinGyu" "Why won't you tell me?" "Because i don't like you. So get out of my sight" "Yoon! It's mignight already! Get inside!" "Jamkkanman WonWoo oppa! Bye MinGyu" On the next day, Yoon found out that Yeon did something that she really hates. Which is, making MinGyu stays away from her. With that, she starts becoming more and more evil.