"Do you know what she did to me"
"I know"
If Byul knew that it was wrong he wouldnt have kept it a secret, Byul knew.
Byul also talked alot with his grandma and has for years and i'm pretty sure it made him understand and not resent Hye-sung!
this will most likely lead to a happy ending where Hye-sung talks to his mom and they all get along
I meant that he doesnt know the full story like he doesnt know what Hye sung is feeling and felt all those years. Byul only knows the story from the mom side. Hyesung is completely in the dark and they never did ask his opinion.
i also feel like that will happened. that they will reconcile but i dont like it. i hope they just make it civil (hye sung and the mom) but not totally get along and fix their relationship. dojin and byul can connect with the mom but i hope hyesung will only be civil.

sorry Byul but Hye-sung is my baby before you. I will always defend him even though, even when he gets a lot of bashing even before. He doesn't deserve to be lied and kept in the dark. Dojin should have at least be honest with him. He can fucking support and talk to the grandma all he want but atleast let him know?? And Byul, you didn't even know the full story