It is about Krystal is a friend to the one of the kingka at the college Mark Tuan.They're just met but they feel comfortable with each other.They met because Tuan's really close to Jung's.Before this,Krystal stayed with her Aunt at Korea.Krystal's mom asked her to continue her study in LA.When the day Krystal Arrived in LA, Tuan's and Jung's decide to go on a vacation together before the school started.That is how they meet each other.Mark had a feeling to Sunmi and he told everything to Krystal.What will happen if Krystal fall in love with Mark suddenly. :D