Tiffany and Taeyeon are best friends and have been living together in the city, and somewhere along the way they meet Jessica there. She has a friend who has a baby or something like that and the girl dies, leaving Jess with the baby but she can't look after him cause she has a younger sister, so doesn't have enough money to look after another growing being. So she leaves the baby on the two girls door step. Tiff and Tae take care of Tao and watch him grow up getting attached to him. On his fifteenth birthday someone comes along either claiming him as their son or asking them to marry him off to their own kin. Tae and Tiff are very upset with this new info and kindly ask them to get the  away from their baby. Both the girls love Tao so very much and want the best for him. Not only do they have to fight with this strange man about their son but also the bully at Tao's school and countless others for his safety and innocent mind. 

(Others from GG, EXO and SJ later on) Going to surprise you guys I hope~ Tao/someone or from EXO maybe?