Also take a look at umji. I think that she "recovered" pretty good after all the hate and that it's getting better after all.
If it's because of the hate, i think yerin will fight her way back, all of them will.
And if it's because of soumu then i think that they just want the best for them and that they + yerin just need some time.
Altough im really afraid about their mental health, i really believe that they'll fight and win against the haters. ;)