Arrive at PEK from DPRK, 2.5 hours to Hong Kong flights.

Arriving from Pyongyang via Air Koryo on a saturday in late October (NOT golden week), scheduled to arrive at 09:55am. A flight from Beijing to Hong Kong to begin my return home to Australia is scheduled for 12:30pm the same day, giving me a two and half hour layover. I don't know the terminals of the flights yet, but is Hong Kong considered domestic and therefore in another terminal? Do I need to clear customs and border control when arriving from DPRK if I don't leave the airport, before checking in to my next flight to HK? Thank You.