Haven't really thought about it in depth, but it's been pretty interesting to see this play out in the American online scans scene as well. From my perspective, Japanese manga was basically the 800 lb gorilla that we were all consuming. At some point in my college days, I think around 2014, this one webcomic called The Gamer came out and was pretty popular. That's the first big Korean webtoon that I recall blowing up in popularity in the online webcomics scene. Actually, I take it back. Tower of God was another popular one as well. I can't remember when that one came out, but I mentally omitted it because I fell off the wagon myself - thought the series moved too slow throughout each season. After those two was Solo Leveling, which really blew up. The premise for SL was pretty generic power fantasy but good enough to entertain on a weekly basis. What really sold it though was the art. Nowadays, if you're reading online scans, you just as likely to run into a Korean webcomic than a Japanese one. (I'm ignoring stuff like the Breaker because I'm pretty sure that started as a print series - the webtoon stuff is a new wave of comics designed specifically for its vertical format)
Recommendations: As someone mentioned earlier -
Peerless Dad
Administrator Kang Jin Lee (Same author as above - spin off
series about one of the characters in the above comic)
Legend of the Northern Blade
Chronicles of the Heavenly Demon
Skeleton Soldier Couldn't Protect the Dungeon (I like it, but admit it's inconsistent. Also, author really likes to emphasize sexual violence against women early on - it's pretty grotty.)
Villain Unrivaled
Return of the Crazy Demon
Probably a lot of other series I like, but these are the ones from the top of my head that are generally pretty good.
Past Life Regressor is another one I just remembered - I wouldn't call it good, but it's more interesting than the typical action fare. Starts out with the most generic premise - fantasy earth where everyone has powers, and one guy lucks into being able to go back in time to do thing right the second time around. What makes this one interesting is that you'd expect this time reset to be about him doing the typical fantasy stuff where he becomes a super powered action hero because he knows everything that will happen beforehand. Instead, He uses his knowledge of the future to navigate the Asian financial crisis and enrich himself through day trading.
Recommendations: As someone mentioned earlier -
Peerless Dad
Administrator Kang Jin Lee (Same author as above - spin off series about one of the characters in the above comic)
Legend of the Northern Blade
Chronicles of the Heavenly Demon
Skeleton Soldier Couldn't Protect the Dungeon (I like it, but admit it's inconsistent. Also, author really likes to emphasize sexual violence against women early on - it's pretty grotty.)
Villain Unrivaled
Return of the Crazy Demon
Probably a lot of other series I like, but these are the ones from the top of my head that are generally pretty good.