After reliving for fifty years, Shen Changgeng returned to his youth with a blood-stained "Old Account Book of the Border Army". In his previous life, he was falsely accused of collaborating with the enemy due to a military grain corruption case, and his entire family was executed. In this life, he wants to turn every black account in his account book into a reminder for his enemies. Zhao Tieyi has made arrangements three years in advance. Caravans and private soldiers are all over the northern border, just waiting for his return. Gu Qingwu, the daughter of the current imperial concubine, holds the secret files of the imperial court and exchanges information with him, but she hides the secret of the orphan from the previous dynasty. Lao Abacus was a quartermaster who made false accounts in the past. His words could overturn the case, but it also led to death. Shen Changgeng started as a border soldier, first checked the old accounts, then raised the imperial court, and finally launched the Northern Expedition - he wanted all those who owed China blood debts to be repaid with interest. But on the last page of the account book, his own name was written...
