Pei Zheng, a modern social beast, was in a car accident and his soul traveled through the Yan Dynasty. He became the powerless and bastard son of the Pei family in Qingzhou Prefecture. As soon as he opened his eyes, he encountered his direct uncle who took away the family property. In a desperate situation, he awakens the knowledge retrospection system, which can adapt modern knowledge to ancient conditions and transform it into practical skills. He improved agricultural tools, made compost, and built a waterwheel and mill, and he started to accumulate wealth from the farm; he gradually won the hearts and power of the people by establishing righteous schools, fighting plagues, and suppressing rebellions; he gradually disintegrated his enemies and strengthened his power by fighting against treacherous ministers, selling salt and iron, and building merchant gangs. With the help of modern wisdom and system, Pei Zheng changed his destiny against the will of heaven and grew from a humiliated commoner to a giant. He wrote his own eternal legend in the ancient court and rivers and lakes.