This one is clearly tagged as yaoi, but I understand it was easy to forget it with all the absence of sex and the great story. I forgot too.
I can't remeber any BL regression manhwa without sex and yaoi tag, I am sorry.
Necromancer survival maybe? Tho it have been on a hiatus
The hunter wants to live quietly is the closest i could think of
Turning might be what you're looking for.
Turning has a yaoi/smut/adult AND mature tag, and has had hints of smut so far. Probablyy not safe in the long run
Hunter wants to live quietly has a Sounen ai tag, so it should be safe.
I am a fan of regressions, hunters or dungeon shit type of manhwa and so estatic when I see it in BL bcs those type of manhwa has typical random romance. the jump scene to sex threw me off bcs this is like basic yaoi where sex is the only way to remind people that they have romantic feelings. Is there any similar BL manhwa like this but no unnecessary sex scene and more focusing on the plot?