Nan Zhaoxue is a tough and intelligent private detective in modern society. She is not a fan of celebrities, but she is heavily commissioned by a young fan who firmly believes in the death of idol Yu Yue (who is also Yu Yue's loyal sister) to intervene in the investigation of the bizarre death of top traffic star Yu Yue. With her excellent investigative skills, she gradually got closer to the truth and discovered that Yu Yue's death was related to her brokerage company forcing her to engage in gray transactions and the overseas capital forces involved behind it. Just when she obtained key evidence (a secret account book or recording), she was discovered by the other party and assassinated.
When she regained consciousness again, she found that she was actually in a narrow coffin, and had become Nan Zhaoxue, a girl with the same name in a feudal dynasty in another world. The original owner's sister Nan Zhaozhao died tragically in the wealthy family's residence, but was falsely accused of "self-immolation due to evil". The original owner sued the government but was framed and was severely injured and died from the cane. The desperate situation of her family being destroyed inspired her to pursue the truth and justice as a detective, and she even shouldered the blood feud of her original body. She decided to disguise herself as a man and change her name to Nanwang, embarking on the path to become her sister and change this decadent world.
She entered Yuelu Academy and unexpectedly met Yu Yue, Bai Zhen, a young man from a wealthy family who had also traveled through time. The two recognized each other, but Bai Zhen already understood. Nan Wang has a firm goal and stands out in the academy with his knowledge and wisdom beyond his time. However, he offends the powerful and is forced to go to Kyoto.
In Kyoto, she first fell into the hands of Princess Nihuang, who appeared to be just, but was actually psychologically distorted by the pain of losing her son. She colluded with the powerful to perform sorcery and blood sacrifices, and almost became a "medicine slave". After escaping wisely, she met the emperor and formed an alliance to fight against the enemy.
