I think so too. Usually author's wouldn't focus on comments from haters unlike here. I was waiting too if the author will use the hater to stir conflict in the story in the future.
I even thought about the possibility of the hater being the brother of ml!
Omg??? Same!!! But I also speculate that Jaeyi's older brother was Ideum's first love. Remember that classmate of his. They looked a like. Also yeah, they could be the same person since it looked like a dummy account and authors like Ideum are usually anonymous online. The possibility of these characters being Jaeyi's older brother is really high. ಥ‿ಥ
I wonder if that hater is going to have a bigger role in the future