In the last years of the Tang Dynasty, the world was in turmoil, and the vassal towns were divided into two groups. It is said that before the Huangchao rebels captured Chang’an, the mysterious organization of the government had carried out its last mission and disappeared. Almost at the same time as they disappeared, there was also the famous treasure that the rebels searched all over Chang’an but could not find. Since then, a rumor has spread in the world that there is a big secret hidden on the legendary Longquan sword.