Responses
I think the storytelling is deliberately broken to accentuate the drama in the plot. In some sense you shouldn't expect rational decision in a world that is deliberately set up in such a messed up way. The only somewhat "rational thread" that was established in the beginning was the family bond between MC and his brother but despite all efforts even that is erased. So the story follows the classic cliché of slowly destroying everything so things can possibly start anew and go towards a better future maybe.
This is at least what I got out of it.
The character motivations in story are so all over the place….I enjoy the ride but god did the choices Yugeon started making for the last 20 to 30 chapters feel all over place and uncontextualized.