It would be great to have a confirmation but AFAIK all UE related stuff from Coloso was always recorded in English UI. Even if it’s originally came from Korean website. Since this course was part of ‘promotion to global version’ list of courses - I doubt that Coloso is willing to re-record a screencast just for changing UE editor lang
The saddest thing, although this one is available for enrolment, it’s divided in 2 parts and the second part will be available somewhere in November, so, I guess we won’t see it until NY