Looking at Mr. Ng as a father rather than a chef at the moment, the expression he was giving was something I've seen plenty of times in my life. He looked to be someone that had a momentary breather from carrying the world on his back because as messed up as this would sound, the father figure was always the one presumed to put up with some heavy shit without the need to talk to others about it.
Granted that there were always exceptions, let's just say that Mr. Ng's situation was also… an exception.
It's not everyday I could talk to a person that forgave his son's killer and if I was in the same situation, I was not 100% sure that I would be able to do the same thing that he did—even if I knew Quinn beforehand.
He had been walking on different shoes that I myself haven't been able to walk on yet though if ever the time comes that I had to be in the same situation as him, I wish I would be able to think clearly and not act rashly.