From what I've read so far the initial story is about Hosik and Sunbae in their recent life where Sunbae remembers everything and meets Hosik and Hosik gets pregnant and all that.
The previous side story is when Hosik and Sunbae had to seperate because Sunbae was of nobility and had to produce heir.
But this latest side story is where Sunbae is reincarnated and remembers everything. But He doesn't get to meet Hosik because Hosik dies before they can meet. So.Sunbae goes into depression because he has memories of Hosik but can't meet him for the rest of his life.
Hope this makes sense to you.
So is hosik like not real, and only existed in sungyeons mind? And in his dreams hosik dies but not like in real bc he only exists in hyungs head? Or was he actually alive but died and left hyung in real life, and now all he has is the memories and dreams he had with him? So in short, was hosik ever really alive or not? Can someone please explain? Thank youuu :D