Korean female ESL students are for the most part in Canada, to
find a mate and get Canadian citizenship , with
returning to Korea not being on the agenda, while Japanese
female ESL students are in Canada for the most part to learn, English, with some willing to "have a bit of fun" on the side, and
then return back to Japan and get into the Japanese work force,
with no intention of remaining in Canada.
The Korean-Canadian population is much larger than the
Japanese-Canadian population as very few Japanese immigrate
to Canada, no shortage of Korean MPA's SP's etc. in Toronto,
while their Japanese counterparts are few and far between.
So at a Karaoke joint, the Korean girls would be general in it
for the long haul and the chance of any mileage would be much
higher if they thought a wedding ring was soon to follow IMHO.