I Want To know Why no One Care about Yun Yun(Yun zhi) Character

I started at  this anime in 5 th season (That was so intersting)  and  also I want to know about all characters  , So I Will  start to watch  1 st season to 4th season, I really suprised the character Yun Yun(Yun zhi) she will take more Care for Xiao Yan, also she sacrifices all for him but he didn’t much care about her and also I want to say “This is not fair” , I think this is not for me  for  all persons who will see that anime have a same questions like it . So Anime Team should take care about that ( Want to Include Yun Yun character as a wife of Xiao yan,This is better Choice )