I want to first start off by saying that I only watched this show because my complained about the ending being very unsatisfactory. When she said this I didn't think it'd be that bad because it was based off a webtoon and the bar is already low.
But when I watched it, the first thing I didn't like was jeongs relationship with seol or the twins. He was very awkward. His character is basically the average rich male bully character that who would have been a side character in any other drama but this one. This guy allows there to be alot of misunderstanding in the drama and is "always right" so most of the drama is the characters suffering from what he's done.
I also didn't like the way seol is treated, up until a few episodes in she is mistreated by everyone a senior thinks she reported a scam, inha hates her for being with jeong and someone changes her schedule.