King Jin is a title in the history of China, which originated from the feudal system of Zhou Dynasty. During the Zhou Dynasty, the emperor would stabilize and restrain the vassal states by sealing the land, among which sealing the king was a higher title. Wang Jin is a title in China feudal society, and Wang Jin has different meanings in different countries and different historical periods. For example, during the Spring and Autumn Period and the Warring States Period, there were legendary Jin Wang and Jin Hou Xian; During the Three Kingdoms period, a series of political struggles and wars took place in the State of Jin, among which Liu Bei claimed to be the King of Hanzhong and the King of Jin, while Mu Rongchui claimed to be the Prince of Yan and the King of Jin.

Wang Jin has many allusions in the history of China, the most famous of which is Historical Records written by Sima Qian. According to historical records, Prince Taizi Dan of the State of Jin did not want to recite all the Book of Songs when he was taught. Instead, he wrote a poem "Feng Dan" according to his own understanding, which is known as "the iron ticket of Dan Shu". In this allusion, the king of Jin symbolizes that he is unwilling to compromise with others and insists on his own ideas and opinions.

The word Wang Jin is often quoted in modern context. For example, the concepts of "Jin, Zhao, Wei and Qin" often used in academic circles refer to the four countries in China during the Warring States Period. The rulers of these four countries all use the title of Wang Jin. At the same time, Wang Jin has also become a brand naming element of some commercial companies. For example, there is a hot pot brand named Wang Jin, and there are also many delicious food and tourism products related to Wang Jin.