I Am Invincible in the Harem of the Undercover Empress.

Shen Yanchuan, a modern social worker, died suddenly while working overtime. When he opened his eyes, he traveled through time and became a scholar in ancient times who was falsely accused of theft. He was trapped in a cell and was in danger. At a critical moment, he was rescued by a mysterious force and learned that he had been selected because of his special qualities to sneak into the Dajing Dynasty, which was in conflict with the imperial court, as an undercover agent. Just when he was hesitating, the "God-level undercover sign-in system" was suddenly bound, and you could get random skills and rewards by signing in every day. In order to get rid of the fate of being at the mercy of others, Shen Yanchuan is determined to accept the task, rely on the help of the system to survive step by step in the dangerous situation, transform from a prisoner to a lurker, and start an undercover counterattack that changes his life in the troubled times. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.