Responses

right? that's why i don't get those people who're telling hyesung shouldn't stop being a parent to byul "jUsT bECaUsE" his past was brought up once again. no, hyesung's not stopping to be a parent to byul at the first place, he just need time. Time to cope with everything he's been through, time to gradually heal from all of trauma his parents caused him. Why people need to be so insensitive ヽ(`Д´)ノ
those people who're attacking hyesung saying he's being a drama queen, probably are apathetic and shows no sympathy to other person. If you really read the whole story line, its very clear that Hyesung's life has been so tough, had a trauma because of how his father treats him. And seeing his father after all those time triggers his trauma he's been hiding, mind you that not because Hyesung is known as bubbly and bitchy, doesn't mean he's already healed from his past.
We can't also blame him for "neglecting" Byul during this time, because if your traumatic past resurfaces, your anxiety is eating you up, your mind is not on the best state. Hyesung probably thinks that locking himself inside their room is much better thing to do than being physically present with Byul and Dojin but not at his best state.