I've posted this on the Asiana and *A boards without much success. Perhaps the greater viewership on this board will help me out:

Arriving HAN at about 10:30 PM on an OZ flight from ICN and would like to pick up a bottle or two at the duty-free. (1) Where is it located? (2) Will it be open? and (3) As an alternative can I shop at the duty free in ICN and carry my purchases with me on the ICN-HAN flight?