The film is based on the true story of gangster Al Capone
. The 1920s was a period when Prohibition laws (1920-1933) prevailed in the U.S. The U.S. government passed laws that made brewing, selling, and consumption of alcohol illegal, which immediately provided underworld gangs with the opportunity to smuggle alcohol. Money-making opportunity. Although there are no formal bars on the surface, there are many hidden bars underground where bar owners are involved in illegal alcohol trafficking. The most famous alcohol smuggler at the time was Al Capone, who wanted to monopolize the entire alcohol turf in the city of Chicago.
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At the same time, the film is also recreated on the basis of the true historical events of the "Valentine's Day Massacre" in 1929. In that massacre, Dae members of one gang were slaughtered by another gang
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