
The author is amazing at trying to make me hate Hysong cause right now I dislike him. I understand that you didn't want the baby but c'mon! Where's your motherly instincts? (SPOILERS?) From the raw I saw, I also understand that he didn't have a good past with his family and this is why I'm want to like him. But right now I'm angry cause he's being selfish even though it wasn't entirely Do Jin's fault but also his. Hopefully he realised that Do Jin really cares for him and they can be together!

Why do they call the eldest brother "hostage"

Lmao, it's not necessarily cuz he's weak.
In time periods like that, it's common for Kingdoms to send out one of their royalty to be a hostage of the Empire.
This is how Empires ensure their Kingdoms stay loyal to them. Hostages are treated well within the Empire in respect to their royal lineages but if the Kingdom in which they hail from starts to show any signs of revolt against the Empire, the hostage would no longer be safe.
OOF she know's how to create a man