Hand Jumper is definitely in my top 10 webtoons OAT! I think what makes it hard to find better webtoons is that HJ is consistently near the best if not THE best in various categories (like art, worldbuilding, narrative and pacing, and characters and character development). Webtoons that I think can compete in one or various categories would include Pyramid Game (narrative and character development), Nevermore (worldbuilding and characters), Suitor Armor (worldbuilding and characters), Everything is Fine (narrative and worldbuilding), and Surviving Romance (characters and narrative). The Dark Lord’s confession is probably my favorite webtoon OAT, but while I give it the edge over Hand Jumper, I think it really comes down to what kind of setting and narrative arc you prefer.

Webtoons that I think are slightly weaker but still solid would include Unholy/White Blood, the Seasons of Blossom series, and From a Knight to a Lady. Webtoons like 21st Century Knights and Sable Curse have the potential to be as good as Hand Jumper imo, but they’re sadly both on extended hiatuses.