We talked about luck in one of your previous posts. Your Chinese or Korean guy example may have been lucky, but he also worked for his luck. So, he knows how hard money are made and remembers what it's like to be poor.
But luck has a different facet. The kind when it hits you unexpectedly. Like winning the lottery, at the casino, 1000%+ on a meme coin, a bet with a huge pot, all while that makes a significant difference to your financial situation, all of a sudden. Many succumb to the pressure of the sudden gains and end up broke in a matter of years due to a string of bad choices, after that happens. The unexpected money simply takes their minds away, and they can't exert the level of control they might've had before, maybe thinking they will never end. That's where bad financial education comes in too. Or maybe they are careless by their nature, and they just didn't have the "opportunity" to show it until they had real money on their hands.
I think the Korean guy was responsible in the way he handled the situation. There's no way I'll ever be rich and not have a second thought about spending 1.4$m on a luxury car.
In reality, even people who suddenly hit the lottery sometimes can be responsible with how they react to, and manage their "luck" because going back to poverty isn't something anyone should do especially if they manage to get out.
However life can make people extremely stupid, especially when they cannot manage abundance.