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I think he didn't read any moral story like greed is a curse in his school🤣

 yesterday 

I believe he always has been the underdog. The way he looks and it feels he's the only person still at work. More likely he has been bullied a lot and greed? It feels to me he sacrificed himself the biggest part of his life and never been rewarded for it. It's what life looks like if you are a good worker. Abused by your employer and the system. You see them take the profit while you shrink every day a bit more till the opportunity is given to....
The mistake? He better would have kept that black hole and went for the free food and extras. It's like those scammers/hackers taking 5 cents of millions of account over night. It's rarely noticed but together it's a fortune gathered within a few hours of time.

it feels he's the only person still at work

Crazy man, doing extrashift to pay those bills he has exceeded to fit in the society and to please others or to fulfil his family's demands or it is just the way of life(some people suffer while others make them suffer).