Will language be an issue during the parade in Seoul?

Hello friends! I'm Michelle from Mongolia. I'm planning to go to Seoul at the end of this year to get a good medical checkup. But one thing worries me — will the language be a problem?

Do I have to speak Mongolian? Is Russian or English enough? My English is not good, but I can understand basic things. Of course, I'll check the last minute to make sure I'm on schedule.

If you've been to Seoul before, what did you do before the appointment? Did you get a translator, or do most of the hospitals speak English? Any advice would be great!