When you turn eighteen, the door of the Ai family will be locked up and you will not be allowed to see anyone.
Why
If you can avoid the calamity of love, you can get over it. If you can't avoid it, it will haunt you and you will never be reincarnated.
Daddy insists that I call you Master Ai. I would rather call you sister. Why don't I compromise and call you Master Sister?
Why don't you come to find me? Do you know how long I have been waiting for you?
If I don't look for you, won't you still come back? I have realized since you left that you are my calamity.