divert to HK? Not likely unless something else was going on.
Here we go again.........
Yes it's only a IDG out, yes it's an ETOPS type...but maybe, given the defect, it was simply a case that the company preferred that the aircraft was diverted to HKG rather than continue to ICN (spares/facilities/engineering support).
Nevertheless standing by for the conspiracy theories and an unknown number of deleted messages.