Ridibooks is primarily known as a Korean platform, and while it offers a massive library of Korean novels, webtoons, and light novels, the availability of English translations is pretty limited. I've browsed through their catalog several times out of curiosity, and most titles remain untranslated. That said, they do have some officially licensed English versions of popular works—like certain web novels that gained international fame—but they're exceptions rather than the norm. If you're hoping for a vast selection like you'd find on global platforms, you might end up disappointed.
Still, it's worth keeping an eye on Ridibooks if you're into Korean literature, as they occasionally partner with publishers to release English editions. For now, though, services like Webnovel or Tapas might be better suited if you're looking for consistent English-translated content. I remember stumbling upon a few hidden gems there, but navigating without Korean proficiency can be tricky.