Forget what I said, I just looked at the spoilers again since it had been some time since I saw it and it’s happening exactly like in the novel #-.-)
The good thing is that the ending wasn’t as bad as I remember
NOVEL SPOILER
- The story ended kinda happy with them alive together, but Illic never says he loves Sayan, he obviously is attached to him, but there never is a love confession, so Sayan is never loved the way he probably wants Illic to love him.
- Even though the duke is sick he is described by Illic as “getting better” contrary to his dream where Sayan dies
- imo Illic loves Sayan, he just doesn’t love him at the same intensity that Sayan loves him, but in canon he never officially admits this (but then again, why cry at the thought of your boo dying then? )

I didn’t read the novel but saw spoilers and thought this was gonna go the novel route. Thank God the manhwa went a different direction, I was getting kinda desperate with that ending ╥﹏╥