Taemin and Kai fonud out they were twins and thought that life couldn't get any more mixed up. Until they found out that their mother was also hiding the fact that she cheated on their father with a tourist and got pregnant again. Their dad never found out, but still being poor they had to give away that baby too. She (you) was adopted by an american family. So Taemin and Kai set out to find her (you) while she (you is just finding out shes adopted.)