Chess Player in Troubled Times

In the 240th year of the Daning calendar, the world was in chaos and refugees were everywhere. Yan Chen, a doctor of history, woke up and became the humblest existence in troubled times - a penniless refugee. Next to him is his seriously ill mother and young brother, and in front of him is the closed city gate and the crowd of men watching eagerly. But he has a broken "Historical Bag" that records everything before the fall of this dynasty - who will win, who will lose, which city will be destroyed, which army will be destroyed. From refugees to counselors, from county magistrates to princes, from the overlord of one party to the common ruler of the world. The world is like a chess game, and all living beings are chess pieces. And he is the one who plays chess.