Tao has been looking after her since... forever. She was three years younger than him and she used to live beside him. Their parents always got along and therefor they were always together, playing games. They even had shared birthday parties, since their birthdays were merely a week apart. They were always together until Tao was scooted by SM entertainment and cut off all contact with her. Not because he didn't want to hang around with her anymore, but becoming famous meant that his privacy would be close to nothing and he didn't want her to get hurt because of hanging around with him.

But what if he meets her again? 

And what if she doesn't remember him?