Why do many men in China like to keep one or two extra-long nails?

Because the long nails in ancient China represented the nobility, and they were well-off and pampered, so they didn't need to work. In ancient times, long nails were a kind of beauty. You see, the nails of emperors and some nobles in the Qing Dynasty are very long. The more powerful the country is, the more nails will be left. Before the Qing Dynasty entered Shanhaiguan, emperors wanted to ride horses to fight without nails, but after Kangxi, rich emperors in the national calendar did not have to ride horses to fight for privileges. It is purely sick for modern people to have long nails.