I'm going to be honest with you, I haven't seen anything that would result in me hating Kiyu. Yes, he judges people off his appearance (and it's infuriating, trust me), but almost everyone judges people off of looks (and rumors) until the get to know the person (Hell, even he was judged based off his appearance and I'm assuming it got too overwhelming for him and that's why he left the agency. Which is why he wears glasses). Also, you got to remember he's just a teenager, and teenagers are still in the process of learning. Luckily, even though be learned his lesson he's still scared of Baek because she always has this scary look on her face, so we really can't blame him or anyone else for being scared.
But if that's not why you hate Kiyu, then please tell me why. I can't help, but think it's because of his judgment since everyone is talking about that.
I hate ML already. By the way, there was someone in the comment section didn't like it when others criticized ML and kept replying in a rude way. It's very childish. Everyone has their own opinion, he or she needs to calm down and accept it