I don't see it as a critique of Capitalism as much as I see it as a critique of "honor" and the inability to change and sacrifice what you see as who you are in order to earn a living. The men are shown as not having the ability to be flexible and just find a different job somewhere doing something else. They MUST work in the same field, doing the same thing, and be respected. It's definitely a cultural difference from Korean to America. Some Americans are like this, but it's clearly different.
No, it isn't. It's about how identity under capitalism is defined by one's work to near exclusivity, and how this limitation is rigidly reified through the compulsive expression of (primarily) patriarchal insecurities. It's also about how "job security" in a postmodern world is a nostalgic delusion, "skilled" labor (the "middle class") is now subject to the same material precarity that has always loomed over the "unskilled" "working class". Just because your job wasn't the first to be automated does not mean they won't make you obsolete as soon as the opportunity presents itself. Capitalism makes everyone dispensable.