TS Entertainment's first mixed gender group, RAINY, has finally made their debut. Achieving a major success. Everything is normal at TS Entertainment. Secret & BAP are helping RAINY out & they all have gotten close to each other. It's feels like... family. When seventeen year old Kang Astrid falls head over heels and starts dating Moon Jong Up is when all the trouble begins. The relationship must be kept a secret... NO ONE can know. Not even the other members of their own groups or both their careers & others will be at stake. Everythings fine, the couple thought. But, once members start falling for others,  trainees in training, no time for Astrid & Jong Up to be together, fights, love triangles, jealousy & soccer games in between. Will they be able to do this or be defeated by everyone?