RedStar OS is an operating system made in North Korea, it is Fedora based with KDE on top that is customised to look like Mac OS
Korean install ISO: redstar_desktop3.0_sign.iso
English install ISO: RedStarEN.iso
To change the Language to English after install. Obtain root access, and run the command:
sed -i 's/ko_KP/en_US/g' /etc/sysconfig/i18n /usr/share/config/kdeglobals
More information can be found here:
https://richardg867.wordpress.com/2015/01/01/notes-on-red-star-os-3-0/
and here:
https://richardg867.wordpress.com/2020/03/31/more-notes-on-red-star-os-3-0/