Really magic, as is another famous Korean film, ('I'm a Cyborg, and That's OK').
The magic is this: On first viewing, the movie(s) seem silly, stupid, or weird, and definitely disjointed.
It's very hard to understand what's going on, and scenes that might explain things seem to be missing. But these tricky Koreans always have a twist of some kind at or near the end, that gives the answer to a puzzle you didn't even know was there.
Then---you have to watch them a second time to understand it all, and to see that---they aren't really silly or stupid or weird or disjointed at all, and, in fact are more cohesive than a lot of other-nation movies. AND-this turns out to be a cute movie.
Recommend, recommend, recommend.