We respect the genius and ingenuity, not only the Korean film but the Japanese manga, the original source.
The original film is a cartoon (Oldboy was first a Japanese manga), and should have stayed that way.
I would say more of my inspiration stems from ‘manga’ or anime.
"Japanese comic books or graphic novels," c.1984, from Japanese, "cartoon, caricature," literally "involuntary pictures." Term said to have been coined 1814 by artist Katsushika Hokusai to "convey a sense of free-flowing composition and quirky style." See anime.