It varies :-)
Your approach may need work.
This young lady is Korean (travelling in Malaysia).
(Or you may be substantially younger than me and so appear more threatening :-) ).
Collapsed tripod with camera at 90 degree pointing down legs used as train "selfie stick" - set timer to 2 seconds, adjust focus manually, press shutter release and swing camera out away from train. Watch for posts and bridge abutments :-(.
Here (my "Old Grey Guy" album) are 100+ people - many are Asians in Asia, who don't seem to mind too much. Not too many Koreans there, but those I have meet did not seem to behave too dissimilarly
The photos below were largely taken in Asia.
Apart from having me in them, the common theme is that that was the first and only time I met these people - I was 'just another guy with a camera'. If you can achieve that degree of empathy with people, a few photos of them by themselves, if that's what you want, is often achievable.
I biased this selection towards those with women in, as that seemed relevant to your question - and it's EASIER to persuade women to have their photos taken than men, fwiw. In the ones where people seem to be standing a bit closer than you may expect - that was their choice - I'm VERY careful not to get myself misunderstood (or, no more so than waving a camera achieves by itself :-) ).
Larger version here