The Mystery of Bianjing in the Seal Tribulation

In the third year of Xuanhe in the Northern Song Dynasty, there was an undercurrent in Bianjing. Xiao Yan, a secret guard of the Imperial City who has a mysterious life experience, is involved in a shocking conspiracy because of the investigation of a "blood jade seal case" - the traditional jade seal that has been missing for a hundred years reappears in the world, and actually leads to the unsolved assassination case of the late emperor twenty years ago. When his childhood sweetheart, the medical girl Lin Wantang, was tied to the altar, enemy spy Wan Yanxue put a poisonous blade against his throat, and three forces were revealed in the underground palace of Bianjing: the powerful Prime Minister Cai You wanted to threaten the emperor as regent, the Mingjiao Fang La planned a bloody restoration of the country, and the Jin Kingdom's cavalry had marched to the Yellow River. Xiao Yan discovered among the layers of lies that he was the orphan of the prince who was replaced back then. And the secret technique of the previous dynasty hidden in the imperial seal will plunge the entire Song Dynasty into a crisis of overthrow...