As Hahaha was the first Sang-soo Hong movie I saw, I found it unusual, and certainly different from the Korean movies and directors I am already acquainted with.
Far from the raw beauty of Hwal and the dark mysteries of Janghwa, Hongryeon, Hahaha's main virtue seems to be the equilibrium found in the different sides of the same story, almost like a documentary made of fiction.
In this sense, Hahaha is not a deep film in itself, even though it is quite intellectual in its approach and structure. The final result is a lighthearted, refreshing and very entertaining movie, with a nice camera work and interesting settings.
The narrative is a bit tricky now and then, and probably it is a good idea to see this film at least twice to untie some secondary knots, even though the story gets clear enough from the first viewing.
All in all, a nice movie that certainly deserves to be watched.