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
Great seat number though.
What’s even the point of flying if you can’t look at the world from up high?
And both B747 and A380 fly much calmer than the smaller, lighter widebodies, which is equally nice for passengers on all classes.
I only ever flew on the upper deck in coach configuration, and the last time I did that was about twenty five years ago on SAA. It wasn't anything special, but it was a little quieter.
It felt like a private jet up there, very cool. And that's even with the awful club world seats where you had to step over your neighbour to get to the aisle.
There's still a few of these in passenger service, so you can easily get it done if it's important to you.
Otherwise, you'll need to figure out how to get on a cargo flight.