Xiao Feng, a modern and warm man who is proficient in history, accidentally traveled to the Zhenguan period of the Tang Dynasty and became the bastard of a down-and-out family in Chang'an City. He is bound to a "historical deduction system" and can predict the direction of future events, but because of his gentle and humorous personality, he always wants to resolve crises with kindness. He adopted Su Han, a young man who was dying on the roadside, and gave him all his money to teach him historical knowledge and help him become an official in the imperial examination. Little did he know that Su Han was a psychologically twisted "white-eyed wolf" - he appeared to be grateful, but in fact he was jealous of Xiao Feng's talent and secretly colluded with the powerful to seize his family property and destroy his future. When Xiao Feng rose to prominence in the court, Su Han stabbed him in the back and designed to frame him for collaborating with the enemy and treason. Xiao Feng was forced to flee, but by relying on his systematic historical deduction ability, he saved the day from danger time and time again and exposed Su Han's conspiracy. No longer soft-hearted, he transformed into a "warm-hearted avenger" and used historical allusions to turn Su Han from a favored minister of the powerful to a bereaved dog. And a bigger conspiracy surfaced, and behind Su Han, there was a shocking conspiracy in Chang'an City. Xiao Feng discovered that the system can not only deduce history, but also rewrite history - but every time it is rewritten, there will be a price. He must find a balance between protecting his family, avenging his enemies, and safeguarding the destiny of the Tang Dynasty. And Su Han's madness goes far beyond that...
