The interesting thing about Kim Dokja and Yoo Jonghyuk's dynamic in fanworks is how it basically flips the script on who's actually holding the cards. In the original 'Omniscient Reader's Viewpoint', Jonghyuk is the all-powerful regressor and Dokja is, on paper, just a reader. But fic writers latch onto this weird meta-level where Dokja's knowledge makes him the one with real control, even if Jonghyuk's the one with the sword. It's not a simple dom/sub thing at all—it's more like this constant, tense negotiation. Does Jonghyuk listen to the guy who knows his entire life story? Or does he rebel against being predicted? That's where most fics live, in that push-pull.
I've read so many iterations. Some lean hard into Dokja's voyeuristic advantage, making it almost creepy and possessive, which I'm not always into but it's a valid take. Others focus on Jonghyuk's frustration morphing into a grudging reliance that bleeds into something else. The power balance shifts scene by scene; one minute Dokja's manipulating events with a whispered hint, the next Jonghyuk's physically dragging him out of danger, reversing the dependency. The best fics I've seen don't ever settle into a fixed 'who's on top' dynamic. It stays fluid, which is way more true to their canon relationship than any straightforward power fantasy.
A lot of writers also explore what happens when Dokja's knowledge runs out—when they pass the point in the story he read. Suddenly he's vulnerable, and Jonghyuk's centuries of lived experience become the dominant force. That moment of shift is incredibly fertile ground for character development and, yeah, for romance if that's your angle. The tension comes from wondering if their partnership, built on this uneven foundation, can survive when the ground finally levels.