Civilization
Whoever come up with the idea of "civilisation" created barter trade ( where people get the things they need /want through a civilised way of exchanging and not killing or snatching), which in turn created the concept of value creation and eventually lead to "Work"
So why do we have to work? Cos that's our civilised method to get what we need or want.
The lifestyle of Eat, sleep and hunt can only be led by an uncivilized being, such as an animal