In Shanghai in 1926, the concession was surrounded by warlords. The Japanese espionage organization "Xuanyangshe" infiltrates the political and business circles, the three tycoons of the Youth Gang control the underground order, and the revolutionaries operate secretly. The protagonist, Lu Chenzhou, is the only survivor of the Jiangnan Lu family's murder. He is burdened with the shocking secret of the whereabouts of the imperial seal contained in the "Dragon Pattern Secret Box".
