Your own mom and your grandma's situation ain't the same at allll.
Hyesung mama didn't actually decided to have you Yes, it may have been an accidental pregnancy but atleast you had dojin papa to after you even if Hyesung had left you.
But think about Hyesung's mama, she literally left your mama just because she couldn't do it and didn't wanted hyesung. Your precious Hyesung mama was literally freaking left alone with no one to take care of with such poverty and as an omega wtf could have happened!? Even as he grew up he was still in need of money so where's the similarity in you and your mama situation here???
(And I'm sure if I can remember, Hyesung's mom contacted Hyesung after knwing that he married one of the richest Alpha just to get money and fake her Motherly love to him .....or else why didn't she reach out to him before anything of this happened, before Hyesung met Dojin??? Why after they're relationship?!)