South Korea and Australia only have grand prix entries in singles.
As a reference. At this point in time, after the JGP, South Korea are on 1397 points and Australia 1320 Points, a difference of only 77 points.
I look at the math a little differently. Excluding men's and ladies JGP/GP, Korea has 1064 points and Australia has 1212 points (842 from stage 1 + 250 from JGP pairs + 120 from JGP dance). So Australia is 148 points ahead.
Assume for the sake of argument that Korea and Austalia more or less tie in men's points (both from the GP).
Then it all comes down to the women. If Kaliani doesn't get any points, and Korean ladies get any points (191 or more from the GP or 225 from the JGP), then Korea wins. If Kaliani gets points at all she'll get at least 191, and Korea would need at least 191+149 = 340 to win. That would require a first or second in the GP or making the GP final.