heheh... dun tell u.
did she refer to the older women next to you as the sister, or is she refering to some other people who is not around when she ask you?
most koreans i came across dun speak mandarin at all. the rare few speak with a very heavy accent. some celebrities managed well with mandarin though they may have just memorised it. i just find it very unusual for the person to approach you in mandarin rather than in simple english (which is more commonly spoken as a common language except for native mandarin speakers). beyond that, anything is plain wild guess.
i often get calls from strangers who do not know me, only want to speak in mandarin and who do not understand simple english at all, and i know they are not locals. given the rampancy of frauds, i typically ignore them. i guess supposedly if there is anything "suspicious", your offering to call the police, other than to protect your photographing rights, will also help to clear from further harassment arising from such possibilities.
