beta
First and foremost, Hyesung didn't deserve that betrayal on both sides.
He was abused mentally and physically. Each of his parents went on with their lives without giving a damn about him. He was in a helpless state that led to meeting Dojin. He needed to face reality as an omega, which is the crucial point of his agony. He was raped, manipulated betrayed and so on.
BUT WE know that, NOT Byul.