Idiom:

Rolling in the money ( very rich )

Hit the book：
Ostensibly
Offbeat
Thumb nose
Commiserate
Reminiscent
Milestone
Merchant

What is Singles' Day?

Ostensibly, November 11 is Singles' Day in China, an offbeat, casually-observed holiday said to have started in the early-1990s by university students thumbing their noses at Valentine's Day by buying each other presents anyway to celebrate—or commiserate—being single. The day was picked because the way the date is written numerically (11.11) is reminiscent of "bare branches", a Chinese expression for bachelors.