Lin Qingyin, a doctor in the Department of History, never imagined that after an ordinary academic salon, she and five other selected companions would be involved in the "Historical Deduction System" - a mysterious space that can conduct sandbox deductions at key historical nodes.
Their mission begins with the "rebels": to save Fusu who was sentenced to death, to protect Yue Fei who had no reason to do so, and to withdraw the spark of civilization from the Yashan naval battle. Every deduction may change the fate of an empire - but it may also pay a price they never expected.
When the mission escalates from "rescuing individuals" to "implanting the system" and finally "protecting civilization itself", these six strangers must learn to trust, face differences, and even endure separation. And at the end of all the copies, Shen Tingyu—the companion who was so quiet that he was almost ignored—hides a truth that has not even been recorded by the system.
This is a deduction game that spans thousands of years. But when the game ends and they bring back to reality, will it be the answer or another beginning?
