When he was young, Han Xiaoman was unfortunately separated from his parents during the rebellion of Pinghou Jing, the governor of various places. Later, he was rescued by a young woman named Qian Lan and her daughter. He recognized the woman as his aunt and spent a peaceful and happy time in a paradise. Two years later, in the middle of the night, Han Xiaoman just returned home and unexpectedly found a group of men in white about to take away the dead Aunt Qianlan, and her daughter Ah Li was also missing. Han Zigao followed along the road, but was eventually discovered. Just when he was about to be killed, he was rescued by Chen Qian, the prefect of Wuxing at the time.
In order to find the murderer of his aunt and his sister Ah Li, Han Xiaoman followed Chen Qian and changed his name to Han Zigao, gradually becoming Chen Qian's close friend and confidant. Later, Chen Qian's uncle Chen Baxian rebelled and proclaimed himself emperor, establishing the Chen Kingdom. Han Zigao was secretly assigned to a secret organization called Diansi by Chen Qian, and cleared many obstacles for Chen Qian to ascend to the throne. In this place that contains many secrets, Han Zigao finally discovered that the group of men in white who took away his aunt many years ago were not the killers of Qi State, but the cold generals of the Dianshan Department. When Han Zigao wanted to dig deeper into the clues and find out the murderer, Chen Baxian suddenly passed away and was rumored to be Chen Qian.
After Emperor Chen Wen and Chen Qian came to the throne, the Dian Dian Department also mysteriously disappeared. Han Zigao, who was on a mission to protect Hengyang King Chen Chang, was ordered by his master to suspend the mission, and informed him of the whereabouts of Ah Li and his daughter Chun Xi, and asked him not to interfere with anything in the Dictionary Department. However, at the begging of Jiang Lingxue and others, Han Zigao agreed to continue secretly protecting Chen Chang when he returned to China...