unions

In the western world, yes. Oddly, laziness by management is not universally tolerated. That said, there's potentially a big difference between Korea and Japan, or even Korea and China, the example nations I'm drawing from my past experiences and knowledge (admittedly mostly secondhand, but my brother has a Chinese-Canadian friend so I can confirm it's expected that a leader actually puts in effort).

The real issue is that the boss usually works late and everyone else is expected to leave after him. This can be abused in multiple ways, and "work long but not hard" is still something said boss could pull.

Not every part of our world has become dystopian in the exact same ways, it seems. Sad that there seems to be increasingly less difference between this Korea and their neighbours to the north. Like choosing between Brave New World and 1984.