Chen Yanqing, a scholar from a poor family, was jealous of his poetic talent. He was falsely accused of colluding with bandits and was unjustly imprisoned. In the dark prison, he relied on his iron-like will, used water as ink and the ground as paper, and studied hard in desperate circumstances. After being acquitted, he even won the first prize in the examination room and became the top scorer in high school. In the end, he returned to Jinling as a supervisory censor, vowing to use the pen in his hand and the law in his heart to clean up the filth and uphold justice, and write a legend that will shine through the iron inkstone and the cold window.