I think you may fall foul of the continuous forward direction rule when you come to HKG-SYD-HKG-ICN.

I tried a year ago to get JFK-LHR-JNB-LHR before getting back to HKG and it was bombed on the grounds that I was re-entering an intermediate continent, notwithstanding the fact that at least one of the LHR transits was less than 24hrs.