Apparently it's termed the "beauty is bad effect" or the "mean girl effect" and really reflects the lens of how most people view Wonyoung as a mean girl because they assume that she must have a flaw and it must be having a bad character because of how successful and happy she is
The hate Wonyoung receives is so deeply rooted in misogyny and sexism because people always wanna assume that beautiful women always have bad/mean characters as their flaws which is just one of the ways society policies women behaviours and demonizes them