Hi of course! Babo Kim scans had that plugin overlay on their website before LINE had officially licensed and started translating the Kubera webtoon. The purpose was to help support the webtoon on Naver originally but it’s not needed since LINE is official to support the author. This is the old website they used with the overlay. (It offers the download link and instructions)
http://kubera-tn.weebly.com/
The plugin is inactive now, but that group still translates the raws for Kubera a week earlier then official. They have a reddit that it’s posted for up to the latest chapter (not an overlay though)
https://www.reddit.com/r/kubera/
LINE English official link:
https://m.webtoons.com/en/fantasy/kubera/list?title_no=83&webtoon-platform-redirect=true
Kubera is my favorite webtoon, enjoy! ヾ(☆▽☆)
Hey! I saw your message on Kubera about using overlays to read Navar webtoons in English. Can you explain what plug-ins I need and how to use them? :))