"I will always be with you unless you no longer need me. Otherwise... I will not leave you!!"
She came and came to him with the promise she made back then. Give unconditionally just to fulfill his wishes. As long as he wants it, she has it. She could do anything, but when she gave everything she had, she realized that she was no longer just a sibling to him. But when it went beyond the relationship between men and women, his cruelty deeply hurt her. She wanted to give up several times, but in the end she couldn't.
Watch him become the brightest star in the entertainment sky. She knew he was getting further and further away from her... But so what? The only thing you can do is wait. When?
Maybe... For a lifetime.
He was looking for something of his own. No one can stop him. As long as he wants it, he will do whatever it takes to have it. He has never been a kind person, and he also knows that his "nice gentleman" side is just for people to see.
And she is so ordinary, without any appearance. It actually touched the unknown cruel side of his heart. Still loves to cling to him. Promise? Do children play in the sand? In this case, there is no need to be polite to her. If someone is being used and bullied by him unconditionally, why not do it? As long as he finds what he wants, it doesn't matter if he sacrifices her. So... When will you find it?
Maybe... For a lifetime.