thanks all! the manual didn't say anything about the accessories
that are supposed to come with the phone, for some reason.
searched on the web too and saw one old post from another forum
and the guy says that he can't find USB cable in the box as well
(his is also KP series but not same model)
anyway, this KP series from LG seems pretty mysterious, because
from what i see on LG's website (including Singapore version),
there's no mention of this KP series anywhere.
did a search and the only websites which mention this KP series
(KP105, KP175, KP199) are from India, UK and UAE, so i think maybe
local retailers bought from these countries and thus you can't find
them easily in SG.
anyway, i went to eBay and bought the USB cable from a UK
seller, now awaiting it to be shipped to me.
that USB cable i bought is fo LG KP110, but my model is KP175,
but since it's KP series and the model version don't seem that far
apart, i'm pretty sure it works.
of course, it's a 50-50% gamble, but it's better than walking
around entire singapore with hundreds of hp shops and going into
each shop and ask the guy whether they sell USB cable for LG KP175,
a model which i think few people heard of before.