Jeon Yang-Jae is Wonwoo's little sister. Their parents died because of a plane crash and only Yang-Jae was lucky to survive. Wonwoo and his hyungs became the new family of Yang-Jae.Yang-Jae is always focused on her studies to reach her dream to be a successful Architect. Jeon Yang-Jae is a 13 year old girl.Wonwoo and Yang-Jae were not in good terms after Wonwoo left for training.Yang-Jae is still Wonwoo's little sister so he decided to take her with him in their dorm instead of putting her into an adoption center.All Rights Reserved