
I still don't understand where this story is trying to go.
Honestly It's getting pretty boring. Nothing happens aside Heeseo just being unreasonable and Taekyung being a spineless blob.

Well duh. That's exactly what I'm talking about. We get that chapter "in the future" but then nothing really happens. And still the story progression is non existent. Do they want to understand what happened back then? Do they want to develop the mc relationship? Cause I really can't see that development, it's all exactly as the first chapter introduced the story ...

i think its just going to get worse and worse until theres a point where we reach the first chapter. Progression from there could go a few routes, a sad ending where Taekyung ends up stuck in that house with Heeseo forever, a different ending where Heeseo eventually gets better and they stay together, A happy ending where Taekyung finally escapes from Heeseo and lives a good life, another ending where Heeseo or Taekyung somehow die and the other is left alone. This could really go anywhere

Still hoping the incest thing is some kinda of joke/code language between himself and his sister.
I don't want to believe the author is going to tie down the ML with a kid.

No it wasnât. He said it wasnât unusual and that people didnât like that him and his sister had a kid. Nothing about them being obligated to do it.
It would have been a more fucked up plot twist, though, the family grabbing the two teenage brother and sister, locking them in a bedroom and commanding them: âFUCK! Or you will be punished!!â

He said it was first done to keep royal blood pure, making it a rule that royal family (immediate or not) were to marry and have kids. As time went on, it just became custom to do so which is why he and his sister got together. No one locked them in a room but incest is all they know in terms of lineage.
Either way, obligated or not, yes the duke is officially tied to a child he had with his sisterâ not that unusual for the time period this is written in.
Omg they so sweet I can't...