The mix of English and Korean make it hard for one language to play it. Maybe update with languages selectable and only have that language for the player?
You were right, and thanks for saying it — this was the third report and I'd been fixing the wrong thing. The menus were already translated, but the combat log wasn't: 111 messages, all hardcoded Korean, and that's the text you read most while playing. Fixed and live now. Hard refresh (Ctrl+F5) to get the new build. If you spot any Korean left anywhere, tell me and I'll patch it today.
One more thing — I made a small thank-you for people who reported bugs. Click the 🎁 button in-game and enter THANKYOU. It gives a [Bug Hunter] title and some travel scrolls. Deliberately no stats: free gear ruins the early game, I learned that the hard way earlier this week. It's just a name tag. Thank you for taking the time to write.