What is the relationship between the heroine and the alphabet in "Beauty Stuffing"? A Why is it called a hostess?

It doesn't matter, just because the leader of the alphabet group, S (Sibai Xu), likes the hostess very much, so other members of the alphabet group help S to get the hostess. As for A, because the woman had saved him, plus she knew and took care of him when A was a child, A always regarded her as her sister. To tell the truth, after reading this novel, I am distressed to death by S. Although both men and women like it very much, I like it and feel distressed by S.