Wang Kui's soul was transformed into a young man from a poor family. His parents died when he was young, and he only had half a volume of military books to keep him company. He studied hard, just to change his destiny through the imperial examination, but the villain and powerful officials secretly subtracted the examination papers, and his success fell short. Faced with this desperate situation, he relied on modern thinking to "take advantage of the situation" and took the risk to sneak into the enemy camp to obtain the secret information of collusion between the examiner and the powerful, which caused shock in the court. The emperor personally interrogated the boy, and the young man expressed his determination to seek justice for the poor family with his firm belief. After that, the young man led 20 death row prisoners to form the "Grass Boat Army" and embarked on an arduous journey to seek justice for the poor in the world. Along the way, they not only have to face numerous obstacles from the powerful class, but also must always adhere to the bottom line of fairness and justice in the struggle for power. Every victory is accompanied by the bitter price of the sacrifice of comrades. If the truth about the fraud in the imperial examination is not revealed in time, the future of more poor children will be ruined. The conflicts between young people and the powerful will continue to intensify, and trust will be lost. But with his wisdom and courage, the young man fought for fairness for the poor family step by step in this troubled world and wrote a legend.