Hyesung’s dad?

His dad hated him basically.

yeah his dad is abusive and all memory that hyesung has of his father was of bad ones so he's scared of his dad and I think he kinda developed a trauma because of that

I don't know what exact chapter but when he was a child his Mom din't have a great relationship with Hyesung's dad. Including Hyesung and his mom. He said that his mother would work and would come home tired, neglecting him and saying that she's too tired to play with Hyesung. By the time that Hyesung was a bit older, her mother bought a toy for him saying that she'd comeback but she never did. That's when reality hits Heyusng that her mother left him. But he didn;t know the reason why. He assumed that this is because of his mom's relationship with his father. When Heysung becae a high schooler (?) or in middle school i think? his father sent him to live with his father's mom which obviously is his grandmother. But his grandmother didn't also want him there. He hates his family even when he was a kid especially his father, he only see his mother as the good thing that happened in his life. Plus let's not forget that he knew ever since that he was a kid that he's a dominant alpha because of that wrong AOB test when they were in grade school. That's also the only thing that keeps him going.

I hope this clear things up for you/ If I'm wrong, feel free to correct me :")

chapter 29

This is totally unrelated but when I saw your name I literally screamed 3racha goooo stray kids

i remember he said his dad made his mom serve his boss or client something like that

The flashback is in chap26 and the time he sees his dad is in 28/29ヾ(☆▽☆)