It's more flying or hopping rather than "walking", although there is a lot of walking in the movie too (outside of driving and car chases that is). And then there is fighting, either with guns or hand to hand combat. But I got ahead of myself ... a lot.
If like me you have discovered Korean action and thriller cinema (either a long time ago or because Parasite gave you a reason too), I do not have to convince you. Actually the movie itself is more than able to convince you - with more than a tight plot and story, that has as many twists and turns as one can imagine. I would wish that the main character would be a bit more charismatic and I know you can fault the movie on certain details too, but not on how it is thought through (convenient timings and other stuff aside too).
Great action, amazing cinematography and a sound design that is as subtle as it is genius. Another winner - even if won't be another Oscar (winner)