The start of the end

Have you ever had to live your life based on someone else's decisions? Well, Kim Yejin has. Due to her parent's career position, it has forced Yejin into hiding. As such, Yejin became Yesung and a little girl became a little boy. She had to live her life as a boy until she turns 22 and that is when she would be allowed to revert back to her original gender. However, in order to keep her safe, her gender switch was kept a secret from everyone except for her family. But then, her secret became harder to hide when she met Park Jimin and everything started to take a turn for the worse.