South korea has always been my favorite.
Here are some other nice ones:
I like the U.S flag but in black an white.
Don't know if it's a symbol of the economic depression that the country is going through or if it represent black struggles though. I couldn't find a definite answer online.
Obviously, or the Soviet flag
not even a weeb, these are just very nice
Norway, also the greatest country on earth
>Chicago flag is cute cute CUTE!
Most badass national flag in the world