
He is a poisoned heir marked for death by the Empress; she is the genius physician who views his life as a fascinating puzzle. In a palace built on shadows and lies, their alliance turns a clinical trial into a bloody revolution. As they stand on the brink of absolute power, the greatest mystery remains: is he her patient, her weapon, or her destiny?

This episode follows Mo Xiaoxian, a master disciple of Penglai Island skilled in medicine, who, at the request of her junior brother, General Gu Hai, secretly observes the Emperor's health during a royal procession. Gu Hai is wholeheartedly plotting for the Seventh Prince, Qi Ce, and hopes Mo Xiaoxian can confirm whether the Emperor, rumored to be in poor health, is nearing the end of his days. With her exceptional sense of smell and medical expertise, Mo Xiaoxian not only diagnoses that the Emperor's vital essence has been damaged due to excessive indulgence but also detects a strong scent of blood during the procession, sensing a dangerous secret hidden behind the royal tour.

Mo Xiaoxian and her junior disciple Gu Hai encounter the grand procession of Prince Qi Jue of the Great Zhou on the street. Mo Xiaoxian is captivated by Qi Jue's handsome appearance, but Gu Hai, with a worried expression, warns her that although Qi Jue was once the renowned "Jade-Faced Little General," his temperament has become violent and ruthless since returning from the campaign. Gu Hai tries to persuade Mo Xiaoxian to undertake a mission (or approach the prince). Mo Xiaoxian initially hesitates due to his noble status, but after carefully observing Qi Jue, she, as a "medicine enthusiast," seems to notice a certain "hidden ailment" in his body, and her attitude subtly shifts.

Mo Xiaoxian, the senior disciple of Penglai Island, discovers that the Crown Prince of the Great Zhou, Qi Jue, is not only poisoned but also has an abnormal blood aura. Driven by her concern for Qi Jue and her instincts as a physician, Mo Xiaoxian, disregarding the danger, sneaks into the Crown Prince's chambers in disguise late at night. Facing the sleeping Qi Jue, she playfully masks her inner tension and anxiety while resolutely undressing him for examination. Noticing his low body temperature, Mo Xiaoxian decides to immediately unblock his meridians to treat him. In the quiet chambers, an intimate and ambiguous interaction unfolds between the two.

This episode tells the story of Mo Xiaoxian, the senior disciple of Penglai Island, who sneaks into the Crown Prince's mansion late at night to treat Crown Prince Qi Jue of the Great Zhou, who is suffering from a terminal illness. Mo Xiaoxian confirms through pulse diagnosis that Qi Jue has been poisoned by "Bai Guanyin," the most potent poison in the world, which corrodes the heart and has no antidote. Qi Jue senses the intruder and, despite the risk of breaking his acupoints and spitting blood, attempts to subdue Mo Xiaoxian. Faced with Qi Jue's violent threat and deep vigilance, Mo Xiaoxian expresses her sincerity in saving him and promises him a long life. However, Qi Jue, trapped by political schemes and tormented by illness, does not believe her and ultimately expels Mo Xiaoxian from his chambers.

This episode opens the prelude to the entanglement between Crown Prince Qi Jue and Mo Xiaoxian. Crown Prince Qi Jue is afflicted with the strange poison "Bai Guanyin" and believes it incurable. However, when faced with Mo Xiaoxian, a female spy seemingly sent by the Empress Dowager, he makes an exception and spares her life, intending to "play the long game." Meanwhile, Mo Xiaoxian, the senior disciple of Penglai Island, with the help of her junior disciple Gu Hai, infiltrates the Crown Prince's mansion under a false identity. Her primary objective is not assassination but to get close to the Crown Prince and use her lifelong medical skills to unravel the "Bai Guanyin" poison, which is considered an incurable disease. Amidst suspicion and crisis, the two begin their initial confrontation with their mismatched identities.

In this episode, Mo Xiaoxian, the senior disciple of Penglai Island, disguises herself as a maid and infiltrates the Crown Prince's mansion to cure Prince Qi Jue of poison. After sneaking into Qi Jue's chambers, Mo Xiaoxian's unconventional actions, such as demanding the Prince undress for acupuncture, raise Qi Jue's suspicion and wariness. He mistakenly believes she is an assassin sent by the Empress Dowager to harm him. As they confront each other and struggle, Eunuch Gui, a trusted confidant of the Empress Dowager, barges into the chamber to present a "beauty" to attend to the ailing prince. To protect her identity, Qi Jue pulls Mo Xiaoxian into the bed curtains at a critical moment, initiating a tense close encounter between the two.

This episode tells how Qi Jue, the Crown Prince of Da Zhou, to deal with Eunuch Gui sent by the Empress Dowager, is forced to turn the fake act with the "medicine fanatic" Mo Xiaoxian in bed into a real one, to deceive the Empress Dowager's surveillance with the pretense of being "indulgent in women's beauty." After Eunuch Gui leaves, Qi Jue punishes the negligent steward He Nianqiu, which sparks He Nianqiu's resentment. In the dead of night, the strange poison "Bai Guanyin" in Qi Jue's body erupts ahead of schedule. He vomits blood and falls to the ground. As Mo Xiaoxian prepares to rescue him, Qi Jue tests her with words, believing this is the best time for her to kill him, and the game of trust between them escalates again.

Prince Qi Jue is saved from his coma by Mo Xiao Xian. Faced with his savior, he remains arrogant and cold, even threatening Mo Xiao Xian with the danger of knowing royal secrets. However, Mo Xiao Xian, with her lively personality and superb medical skills, is unfazed by his threats. She casually reveals that the empress dowager is the one who poisoned him. During their conversation, Mo Xiao Xian drops an earth-shattering secret that leaves Qi Jue utterly shocked – he is not the emperor's biological son. This episode ends with Qi Jue's bewilderment and the suspense surrounding his true parentage.

This episode sees Mo Xiaoxian revealing a shocking secret to Crown Prince Qi Jue: the current Emperor is not his biological father. This revelation instantly clarifies for Qi Jue why the royal family has always been cold and ruthless towards him, eager to eliminate him. Despite the immense psychological shock, Qi Jue does not collapse. Instead, it ignites a fierce will to survive. He officially grants Mo Xiaoxian authorization to use any medicinal ingredient in the world to experiment on him, as long as it can save his life. As a "medicine fanatic," Mo Xiaoxian is overjoyed by the patient's cooperation.