Ok, this is how it goes

May23
SIN-HKG (CX 734)16:05-20:00 (A330) my next flight is the next day , right when the clock hits the next day

May24
HKG-YVR (CX888)00:05-21:05 (77A)

The question is, can i leave the airport to pass something to a friend in Hong Kong ??? do i need to re-check in when i enter the airport ?