What Do You Mean, My Father-in-Law, the First Emperor, Knew I Was a Spy?

Zhang Yang transmigrates into the Qin Dynasty as an orphan adopted by Zhang Liang's father. The original Zhang Yang has been brainwashed by Zhang Liang since childhood and is meant to be a disposable pawn in an assassination attempt on the First Emperor at Bolangsha.

As soon as the male lead transmigrates, he discovers that he is at Bolangsha, where he has been brainwashed and designated as a sacrificial pawn. While grumbling to himself, he is suddenly overheard by Ying Zheng, who has just arrived with the imperial inspection tour.

Through Zhang Yang's thoughts, Ying Zheng uncovers the conspiracy and is both astonished and curious about the male lead's identity.

After foiling Zhang Liang's assassination plan, Ying Zheng realizes that Zhang Yang has no desire to rebel, knows secrets from history, and possesses astonishing technology from the future. Rather than expose him, Ying Zheng decides to deliberately promote him, using him to develop and strengthen the Qin Empire, keep the remnants of the Six States in check, and destroy their schemes to overthrow Qin.