Snowpiercer is one of my favourites. Its amazing how you can take a seemingly silly idea about an apocalypse where the sole remaining human survivors are stuck on a train powered by a perpetual motion engine, and make it that good.
Also Snowpiercer is a sequel to Willy Wonka and the Chocolate Factory.
A couple (I've watched way more of these than I care to admit):
The Country I Saw (1987) About a cynical Japanese journalist, suffering from PTSD because of his experiences as an attaché during World War II. He visits to the DPRK and meets some of the people he saved from Japanese troops during the war.
Myself in the Distant Future (1997) Kind of a socialist rom-com? But better than it sounds. About a spoiled, directionless young man from Pyongyang who falls in love with a girl from a construction shock brigade.
Story of Our Home (2016) Coming-of-age story, but different from western ones: growing up means you learn to accept help from the community.
Traffic Controller at Crossroads (1987) Female traffic cop in Pyongyang, and her interactions with various people on her street. Quite cool to see a film portraying close friendships between men and women that aren't necessarily sexual or romantic.
Bear in mind, all these are filmed very much like Soviet movies during the 1970s. So the style takes a little bit of getting used to. I hated it at first; now I prefer it to western styles.
There's a theory that season 2 is about to reveal that it's set in the DPRK and is meant to showcase that North Korea is the worst: https://yewtu.be/watch?v=gmEVUxVwUWk (warning, lib video)
Which, if true, makes it libtrash. It's just a theory though and we'll have to wait and see.
In general, it's a pretty good commentary on capitalism and what it forces people to do, but certainly not the best in that category.
That's one thing about movies made in capitalist countries with anti-capitalist themes... since they can't show a successful revolution, they by consequence can't have happy endings, or protagonists who win, and so are almost always incredibly depressing. I wanna see a goddamn successful revolution and a happy ending, we have so few of those, but they moved mountains.