Zhi Yan has known that he should be good to his sister since he was a child. This little girl who was brought back by his mother is the person he will protect for the rest of his life, even if she does not belong to him in the end. So he wants to do his best to take care of her and love her within his own ability until she no longer needs him and has someone new to love her. He will not hesitate to give up this position to her "him" in the future. But in the end he still failed to do it...