For the concept, this is like a post-apocalypse world where the mc was found by the ml, a some sort of a leader in their safe base. Story basically delves into the psychological reasoning of the ml since he lacks any moral principle and how the mc would escape the place.
I'd say its worth reading considering the art style and interesting storyline if you want to know like "huh, what made the ml like that tho? is he even human, or not human?". Cuz truly, we're questioning if he's even a human despite all of the people in the base being human.
Post-apocalyptic but they don't go over the details as very soon they are all moved to secured area.
It's interesting dark romance? Usually MC is mistreated, love interest falls first and goes about making MC fall for them later (usually with the power of d***).
This one does not follow this trope. Don't want to skillet too much...
Hope that helps

Just wandering what it is about and if it's worth reading it