Try Eleceed. Although it was not as bad ass as Jinwoo, i felt the same excitement while reading it.
SSS-class suicide hunter is good too
Try weak hero, although it's nowhere near solo leveling, and it's not supernatural, I enjoyed it
Oh my the art looks gorgeous and the synopsis is so eye catching. Thanks
Descent of the demonic master
You can also try "Return to Player" & "I Log In Alone"
"Capture the Golem and Escape Poverty" is good too
Manhwas with this kind of mc. With almost no romance at all. For example trash of the counts family, omniscient reader, beginning after the end.
Desperately need this kind manhwa.