According to legend, the Sui Emperor secretly cultivated a group of killers, named “Twelve Dead Men”. The “Twelve Dead Men” had been raised among the people for many years and had never appeared. They have long been stationed in every corner of Chang’an. With Li Yuan’s accession to the throne, this rumor became more and more intense. After Li Yuan’s registration, although Datang Jiangshan is well-known, the existence of the “Twelve Dead Men” is a thorn in his heart.