A modern soul transmigrates into Zhang Yu, the legitimate eldest son of the Marquis of Yong'an. Abandoned by his biased birth mother and father since childhood, he is left to endure hardship in the countryside. After returning to the marquis's residence, he works tirelessly in business to support the family's estates, only to see his younger second brother, Zhang Heng, who has mediocre talent, take all the glory in his place. When Zhang Heng gets drunk and injures a member of the imperial family, the entire family forces Zhang Yu to take the blame and go to prison to protect their heir. The moment he enters prison, Zhang Yu activates a system that grants him one year of martial cultivation for every day served, a random peerless martial art every ten days, and the extraordinary ability to see through objects with his Heavenly Eye.