The people that didn't come to apologise are pathetic people who have nothing of value, that's why they jump on rumours and play along, so when they're proven wrong they don't apologise, because they're scum. They take pleasure in other people's struggle, it's entertainment for them, they don't care about right or wrong, they just want a free target.
Also, I feel sorry for Yeoryong too. The reason she's so obsessed/in love with Ham Dani is because, the bullying that Ham Dani faced just now until chapter 98, this is what Yeoryong went through her whole life. Having Ham Dani who was her only friend, turned into a crutch for her. Otherwise realistically no person would actually survive that kind of mental stress.