Major Cast: Sohee Hongki Stephy Seunghyun Minor Cast: Yubin Nickhun Theresa  Sohee and Hongki had been dating for 2 years, but  Stephy a exchange student fell in love with Hongki, and they even went out. Sohee found out, and she tries to erase her memories, but it never happen. Then one year later after her debut as a singer, Hongki became a singer too with Stephy now they see each other