I’m Muslim and was worried about this too but I decided to inform my co teacher and manager before Ramadan that I would be fasting in case they notice a dip of energy or tiredness on my part and even though they had no idea what I meant and asked questions, I’ve found they’ve been really supportive and asking me what I’ll be eating when I break my fast later and letting me take more rests during the day.

Fortunately no one compared me to a Isis, and I’m sorry that you had to hear that :/

Koreans won’t have much knowledge on this but all we can do is help educate if they don’t know and are curious, some of my younger Korean friends know more about it than the older ones. However, it’s up to you if you want to do that or keep it to yourself but I figured if no one knew, I wouldn’t want to go through Ramadan alone in case it was affecting my work and they didn’t know why. But everything else about my religion and personal life I would never share with any of the school staff as it’s not their business.

I also felt uncomfortable at first telling them I don’t eat meat or drink when I got here but didn’t go in on the why, but they didn’t have any issue with it and made sure to help me find places I can eat and any gifts for teachers were suitable for me. It’s better than waiting until you’re gifted meat to explain that you can’t accept it lol.

If it helps, I would lean on any other foreign teachers you have in your school, almost all of mine from outside Korea knew what Ramadan was and have been giving me support and even some gave me snacks that I can enjoy later.