It's slow burn and their relationship progresses naturally.
I'm glad we're getting this and not the typical banging 5 chapters in.
The story has a slow start and will pick up from now on as well as their romantic interactions. But the romance isn't exactly the focus in the first place.
If their romance progressed any quicker I think it would've felt really rushed and unnatural, especially since J was mostly annoyed with Sayoung for a long time on top of J fighting with his feelings regarding him being the boy he saved. The progression is perfect the way it's paced.
It doesnt have a Romance tag to begin with so idk why youre setting yourself up for a disappointment. If you wanna see men fucking and kissing every chapter, then this is not for you. I'm glad BL stories are branching out and making romance the subplot while the main plot actually is something other than angst, misscommunication, and rape. Pls properly check the tag next time unless you want to be disappointed again.

I know it’s not straight up yaoi but the fact I’ve only seen them sorta cuddle on the couch and that’s it for 40 something chapters + nothing really interesting happening in this solo leveling universe is rly boring… can the world end yet or can they kiss