
What Hyesung did was so out of the context of his supposed character. Like what the hell are you doing when you're so against being an omega. It doesn't make sense so I hope this part ends quickly. Maybe if Hyesung really won't have a character development then shit leave him to be with that alpha and make a new lead partner for Dojin who will accept him and his son. And Dojin don't dare find him. This cycle is tiring though. Let Hyesung figure it out himself afterall only when you left will they realize your importance.

Bond? What does that mean?

In omegaverse if an omega is bitten on the neck by an alpha during there heat they are mates and the omega is only able to have sex with there mate but an alpha can still have sex with anyone. A bonded omega is sick if it has sex with someone other than there mate.
Hope that helped (●'◡'●)ノ( also google about omegaverse it's more detailed)

I think it’s like mates/partners, in this story there was knotting during sex at some point and I think knotting can form a bond, in some other omegaverse stories people become a bond by biting, https://www.google.co.uk/amp/haberkonium.tumblr.com/post/146555840779/omegaverse-explained-knottingbonding-edition/amp this link will help explain.
I hope it will proceed soon :((((
I read the raws TIL CHAP 75 and OMGGGG I'M SO HAPPY! THIS IS SO BEAUTIFUL. I LOVE THE AUTHOR. THEY KISSED! THRICE IF I UNDERSTAND CLEARLY. GOSHSHHSS IF ONLY I CAN UNDERSTAND CHINESE I WILL TRANS THIS. SOMEBODY PLS