The boys have finished promoting in Japan for their albums and finally went back Korea for studies. All of them have been selected to the same University. A while after their settlement in the school, a girl called Krystal came to their class. She's from US, but moved to Korea for studies. Every guy in the school believes that she is an Angel since she acts all nice and polite, but our boys have found the Krystal's real-self. She is an Ice Princess, a mean one.

Main characters: Krystal, CNU, Jinyoung, Baro