i believe many people think korean are good because of those korean drama. in actual, go anywhere and if you see korean tourist, most likely they are loud and boorish.
i still remember vividly when i was in angkor wat 2 yrs ago, the whole temple ground filled with korean shouting and they just cut or just stand in front of you when they want to take photo. only when u climb to some high ground, u find some quietness

they were loudly in korean, so no way they can be mistaken as prc