Hmm, 'Dungeon Diver' gets mentioned a lot in the same circles as 'Solo Leveling' and 'The Beginning After the End', but titles can be tricky. I spent a good twenty minutes last week trying to find the right one because there's a 'Dungeon Diver' and also a 'Dungeon & Artifacts' sometimes translated similarly. My usual route is just hitting up Webtoon's app first—they've got official licenses for a ton of series, and if it's there, the first three episodes are almost always free and the translation is solid. It's worth checking even if you have to scroll a bit.
If it's not on Webtoon, the landscape gets a bit messy. A lot of those manhwa end up on aggregate sites with questionable ad overlays and translations that swing from decent to robotic. I sometimes use those to see if the art style clicks with me, but then I hunt for an official release to read properly. Honestly, for a clean, legal first chapter, your phone is your best tool; the Tappytoon or Manta apps might have it, and they usually give you a few free passes or a subscription trial. I'd start there before wading into the wilder web.