She wasn't actually. She ran away from an abusive relationship and left Hyesung there....not that his dad would have let her take him though.....she met a new partner and moved on. Hyesung thought she was dead....no one told him that, that's just the only conclusion he could draw for why she didn't come back for him.
I’m sorry but she is. She left ALONE leaving her child knowing the dad is abusive. A good mom would take their child and protect them, even if they had to struggle out in the streets. She also could’ve returned for him when she was settled but no, she completely ignored his existence and started a new family. So clearly she didn’t care for him.
SHE IS A BITCH.
She TRADED her child for freedom. She could leave her child if she has no choice, then she can watch and keep him safe from afar. YET, SHE DIDN'T EVEN TAKE A MOMENT OF LITTLE CHECK UP FOR HER OWN CHILD. She went and build another family. Trying to bury the past, INCLUDING HER OWN CHILD. When the end family know about her past, they left her. DESERVED, who want to be with someone who abandoned their own child.

I know this is Byuls story and all BUT THAT DOESNT MEAN THEY HAVE TO BUTCHER Hyesung!!!
"I hope mom meets grandma too" BOY IF YOU DONT SHUT THE FUCK UP