Sorry but both sides are valid in this argument. It’s clear a lot of yall aren’t parents and don’t plan to be any time soon. As a parent, you shouldn’t dictate who your child can stay close with as family (unless that other person is a danger to them). Projecting your bad relationship with your mom/dad to make your child not like them right off the bat, isn’t a good thing. That’s telling them who they should hate, etc. without the child learning for themself and also denying them another person who potentially could care for them.
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An EASIER way to say this is: it’s exactly like how divorced parents act. One parent tells their kid that the other parent is bad- which denies them a relationship with the other parent. Sure their romantic relationship could have turned out terrible, and the other party may be a bad partner but that doesn’t automatically mean they’re bad in other relationships. (Ex: bad husband, but good father). The child should be free to stay in touch if they want.
Hyesung is free to hate and never forgive his mother. That’s his own choice and no one should tell him to forgive her if he doesn’t want to. But he shouldn’t ban byul from seeing her just cause of his own feelings. He should be able to tell byul the reason and that he was hurt by his mother. But at the end of the day, byul should be the one decide if he keeps in contact with the grandma. It is his life and his relationships to choose. Dojin at least understood that part by allowing Byul to choose to see the grandma. It’s clear this story tells you about how even when one person has done something bad, they can change eventually. Hyesung forgave and got together with Dojin. He should be able to understand Byul’s pov since he went through a similar experience.