In order to save his sister, Chen Fan took the charge of killing Chen Fan's parents on behalf of the wealthy young man Zhang Hao, and was thrown into a mysterious prison where serious criminals are held. Four years later, Chen Fan, who became the king of the Mysterious Prison, was released from prison for meritorious service and found that his fiancée was about to be engaged to Zhang Hao and his sister was missing. Chen Fan relied on the martial arts and medical skills he learned in prison to eradicate the Zhang family and conquer the richest man in Jiangcheng. Afterwards, Chen Fan traced old cases and discovered that the real culprit behind Zhang Hao was Zhao Tiansheng from Nan Province. He gradually eliminated Zhao Tiansheng's power, found evidence to clear his name, and finally sent Zhao Tiansheng to Xuan Prison to be punished.
