In the first year of Shaoxing, I traveled through time and became a refugee who was about to starve to death. Fortunately, I am a lecturer on Song history. I know that Yue Fei will die in ten years, Qin Hui will betray the country, and the Southern Song Dynasty will be peaceful for 150 years. Can you get perfect marks if you know the answer? No, every stroke on the examination papers of this era is stained with blood. From the refugee camp to the minor officials in the army, from the clerk who borrowed the knife to kill people to the single-handed counselor - I thought I was changing history, until one day I looked down at my hand and realized that the blood on the knife could no longer be washed away. Power is a knife, and those who are good with the knife must hurt themselves first.