From his very few flashback appearances in LOCH and ROCH, the impression that we get of Central Divinity Wong Chung Yeung's personality is that he was a grim, serious, borderline somber character. We don't see any example of Wong Chung Yeung telling someone a joke or laughing at someone else's joke.
Of course, there's Wong Chung Yeung's martial brother Chow Bak Tung, whom as we all know, was hilarious. Do you think in any of those years, Chow Bak Tung's silly antics ever made his serious elder brother laugh out loud...even once?