My friend is a second-generation rich kid, 28 years old this year.

He eats, drinks, plays, and has fun every day, and often goes to bars when he's free.
One day, he noticed a flight attendant at the bar, she is beautiful, with a good figure, and this time he was truly smitten.
He invited her to a high-end restaurant for a meal.
After eating, he took out a black card from his pocket, and casually said: "There are five million in this card.
For every meal you have with me, I will tell you one digit of the password, how about that?"