Without responding point by point, I do agree that much of what happens to the rich family is undeserved (yet the real question is about the structure and distribution of deserts to begin with). I also agree that the Kims were conniving, pernicious, and, at least in the fathers case, murderous even (but yet again, the real question is structural: how and why is morality engendered in the way it is, in the film?).
But to say this and leave it at that is to (1) ignore entirely the cinematic elements of the movie and remain inadequately at the level of sheer narrative; and (2) ignore, as I said, the utterly obvious societal positions that inform the actions of the characters (which in turn is why the film - to anyone with a half-developed cinematic eye - acts as a commentary and critique of the existence of those positions, and their pernicious effects).
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To begin with the second point (2): there's no doubt that the Kims are hustlers and will do almost anything do improve their lot. But this takes place against the backdrop of their terrible living conditions: they have shitty/no wifi, drunks pee outside their window, their house gets fumigated, etc. Their desire to improve their lot and their conditions of living cannot be treated in isolation, the one informs the other, and if you try and treat their individual actions without taking this into account, your reading of the film will be absolutely stunted. This doesn't
excuse their behaviour, but it certainly informs and motivates it. It is, as people everywhere have been quick to recognise, core to the film's critique.
This, in turn is contrasted with the exorbitant privilege of the Parks, whose needs are expressly not that of just survival, but of sheer excess. Without pointing out the obvious, it's clear their approach to the world is similarly informed by their position in life. The mum says it outright!: "She's nice because they're rich... If I were rich I'd be nice too - even nicer!". The ultimate confirmation of this 'structural' reading is of course the discovery of the man in the basement: not only was he (and his wife, the ex-helper) in a very similar position to the Kims, they too, are driven to do what they do by their terrible position in life. It's no mere coincidence that their lives are so parallel: this kind of thing is pervasive - it's happened before! That's part of the mixture of tragedy and comedy of the movie (Marx: "first time as tragedy, second time as farce"), where the whole situation is both incredibly sad - considering the lengths people are driven to to survive - and hilarious.
A quick note, too on substitutability: not only does Mr. Kim 'substitute' the basement dweller by the end of the film, but so too is the entire film based on the substitutability and replaceability of the working class. Each member of the Kim family literally substitutes for a former worker, in a way that couldn't make the class dimension of this film any more obvious: we're not talking about good and evil, but
structures which homogenize people along class lines. If not the Kims, then someone else - in this case quite
literally another family (or couple, rather), in their place, sharing the same class predicament. Given the substitution of Mr. Kim in the basement and the arrival of a new German couple in the house at the end of the film, one can even imagine the cycle of substitution perpetuating indefinitely...
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So the attempt to treat the characters' actions apart from their social conditions - and in turn, to not see the film as a critique of those conditions - is belied at every point in the film. This brings me to the first point (1), regarding the film's cinematic quality. Bong is on record expressly characterising the film as a "stairway movie", in the vein of a series like Downton Abby and it's precursor Upstairs/Downstairs, all situated in a genre well known to be social commentary. This is cinematically marked by the literal living orientation of the two families: The Parks live "down", their house is in an alley at the bottom of a giant stairway, while the Kims' house is up a hill, up a set of stairs. These spatial orientations are themselves markers of societal difference, brought out expressly in the storm, where the Parks' house floods, and the Kims watch the storm from the serenity of their living room, while their child - in yet another mark of utter privilege - 'goes native' in his little tent in the garden. Significantly, the Kims are not alone in their predicament, their entire neighbourhood ends up in emergency accommodation in a stadium(?). This is a story that goes well beyond mere individuals acting in 'good' and 'evil' ways - a reading reductionist beyond all filmic evidence.
The second cinematic element to take into account is simply the fact that the story is told from the Kims' perspective! It's their successes and their failures which the movie tracks, and it's filmed quite obviously in such a way that we (are meant to) root for their successes and feel badly about their failures. Their eventual success at 'replacing' all members of the previous help is quite clearly filmed as triumphant (the sequence where they frame the previously maid is positively celebratory at the end), and the tension as they hide under the table is nail-biting because we are quite obviously hoping that they are
not discovered. Then there's the fact that Bong goes to great lengths to humanize the Kims: we spend time with them, see them joke and laugh with one another (most obviously at the beginning of the film, and then again when they are luxuriating in the living room while the Parks are away). The contrasts in disposition between the Kims and the Parks are obvious too: the relationships among the Park family are cold and formal - even the sex is awkward and anything but passionate - while the Kims' relations' to each other bustle with warmth and joy. That anyone could think the Kims are meant to be villains is plainly ridiculous.
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So some lessons to draw here: First, this is not a morality tale. The accent is heavily on social position, foregrounded everywhere throughout the film as informing action, which makes the film a
political and not
moral play. The Parks and Kims are, to a great degree, representative of class, and the tragedy that unfolds as much a commentary on the tragedy of class relations as it is the actions of individual people. Second, those who are looking to see the film portray the rich as 'evil' or 'immoral' and then faulting the film for not showing this ought to themselves be faulted for setting up false and unwarrented expectations that have nothing to do with the film and then complaining when those expectations are not met. The fault here is bad film comphrehension, and not bad cinema. The Parks' being overtly 'immoral' and 'deserving' (of what happens to them) would make the film
worse, not better. It would make the story revolve around
individual action, personalizing the story and undermine the fact that what matters is not 'who' the Parks are but, as it were, 'what' they are. It would undermine the story that Parasite is trying to tell.
The same applies
mutatis mutandis, to the Kims. Their desperation and the lengths they are willing go to is essential to the story: their being more morally pure would not make us 'side' with them, but also undermine the critique of class relations that the film is attempting. Those who think that Bong is not successful because the Kims are 'villians' (thus, presumably, not making us identify with them) miss the point
entirely. It's almost as far from the point as one could possibly be. What they 'want' the film to show is exactly what it aims to resist: the personalization of class conflict. That 'the rich are part of the problem' is
not the point. That a class structure exists in which there are distributions of polarized rich and poor to begin with at all, however, is (incidentally, this seems to be a point that many critics of the left seem incapable of understanding). The rich could be angels, the best people in the world. And
still the critique of class would hold.
Anyway, this was fun, I don't usually spend so much time on posts, but you asked for analysis rather than generality so there you go
:)