Don't forget to check yourself out when you're in HKG
Otherwise they will look around for you since you I guess have the HKG to HAN boardingpass
you wouldn't necessarily have the HKG HAN boarding pass (i did not) because they can't check you in until the day of departure and if you are leaving the US they wouldn't be able to give you the boarding pass as you are technically leaving the next day. that is because you are probably checked in before midnight (even though the flight leaves after midnight)
when i asked my bags to check through to HKG, they just told me i would have to check in again to HAN at HKG - which i was fine with and had no plans of checking in that segment at all