"Are you sure it was me that who made you so miserable?"
"I haven't done anything, so what should I do?"
"Stop blaming others. Because self-pity is nauseating when it crosses the line."
Yeryon has pointed out nicely that bad things that happened to Seori was not because of her, so why then she said something clearly evil: "I don't want to see you happy?" She could have worded her stance differently, like "I simply don't like you," or "I don't think you're a good match for my brother," or anything else. Her pre-condition was just opposing and "bullying" Seori afterall, which she had always did with good reasons.
