Using MB profile and the "lost password" link leads to the"?lost-password=true" endpoint. But the page's strings do not follow the current language(Korean). It seems to me that the strings are from the WP core, aren't they? Can you guys check out if it's working properly? It is showing English, now.
Please update the new version of MB AIO to v1.11.12 to get support for Loco Translate to translate all extensions inside MB AIO. Going to Admin dashboard -> Loco Translate -> Plugins -> Meta Box AIO then you can see extensions' translation ready. https://share.getcloudapp.com/d5uW4m4B