Why are four single young men called Diamond Kings?

The idea of ??calling bachelors "王老五" comes from the old movie "王老五" in the 1930s, and a theme song in the film was also popular:

Screenwriter Cai Chusheng

Starring Han Langen

Yin Xiucen

Wang Cilong

Lan Ping

Photography by Zhou Daming

Synopsis

Wang Laowu is a porter wandering on the docks along the Huangpu River. He is thirty-five and has not yet gotten married, but he falls in love with a " He sews a "poor girl" girl, but the girl doesn't love him. Later, the girl's father died, and Wang Laowu helped her. She was deeply moved, and she married Wang Laowu. They settled down in a shantytown and gave birth to four children. Their life deteriorated year by year and they often suffered from hunger. After the outbreak of the 128 War, the foreman who became a traitor tried to bribe Wang Laowu and asked him to set fire to the shack to disturb people's hearts, but Wang Laowu resisted. So the foreman in turn framed Wang Laowu as a traitor, shot Wang Laowu to death, and set fire to Wang Laowu's shack. The fire attracted bombing by enemy planes. Wang's wife and children escaped from the sea of ????fire and lay on Wang Laowu's body crying. With hatred for the enemies and traitors, she was determined to bear the responsibility for her husband who died unjustly. The responsibility of raising children...

A few years ago, Hong Kong filmed the movie "Diamond King", which created another image of four single men, so the current "Diamond King" is better than that of the past Wang Laowu is even more popular.