Yoon Sun Hee used to be a trainee for years at Jellyfish entertainment. When nothing looked bright for the girl group to debut, eventually all of her group fell apart leaving Sun Hee be the only one still in the company, and the company had no plans of letting her debut as a soloist. As she was told that her times as a trainee were over, she was asked to stay and teach the younger girls interested in dancing and who would have the potential to be the next debuting group if their recent group