Lufthansa still has a number of 747-8 and 747-400 in active operation - while there's evidence that the routes are scaling back, there's at least a few more years to fly one. They're even refurbishing the interiors to have a more competitive long-haul business class offering.

Korean Airlines has a handful of 747-8 in active operation but they're making moves to retire them especially post Asiana merger.

Air China also operates a handful of 747-8 and 747-400 on both international and domestic routes.

FlightsFrom is a great resource to find routes for specific aircraft: https://www.flightsfrom.com/explorer/FRA?aircrafts=747 https://www.flightsfrom.com/explorer/ICN?aircrafts=747