The soul of Zhao Chengfeng, a doctor of history, traveled to Jingkang Corpse Mountain and predicted the catastrophe but was imprisoned. After witnessing the burning of Bianjing and the blood-stained Yangtze River, he gave up saving the Northern Song Dynasty and cultivated the fire incognito - targeting the young Yu Yunwen. After twenty years of planning, under the thunderous artillery fire in Caishiji, he was dying when he heard the good news: "Sir, it's done!" The blood-stained doctoral certificate slipped, and no one knew about this guardian of civilization from the future. (The AI flavor in the front is very strong. It is recommended to slowly read back and it will become more and more humane.)