As far as I know, the upperdeck business class seats start from the row 15 and ends with 21 for 747-400s. Well, not all 747s are the same, but they seem to number upperdeck business seats the same way. (Please, someone correct me if I am wrong.)
So you seem to have been pre-assigened on the main deck all the way from JFK to ICN and back.
Regards.