What a rollercoaster of emotions! It's unlike most movies I've seen, in that you can go from something dreadfully serious, to extremely infantile in the blink of an eye. However, the movie does both well.
Sometimes the moments stretch on, but this probably has more to do with the difference in what korean audiences expect versus the western audience.
Wholeheartedly recommend this movie as something that can be enjoyed with a family or someone who cares about well made movies. The creators absolutely tried to make something special here, and all of the actors did an amazing job.