Qin Feiyang was originally a talented student from a medical family, but unexpectedly fell down due to a toxic attack while trying the latest medicine. He traveled back in time and became the Crown Prince of Zhenbei. However, as soon as he woke up, he saw two assassins trying to castrate him. Fortunately, he managed to dodge them in time and shouted for help, only to be escorted back by Zheng Feng. Immediately afterwards, Qin Feiyang received an imperial decree to shelve his engagement to Princess Linglong. Unable to accept it, Qin Feiyang led Zheng Feng to visit the princess's mansion at night. I just didn't expect Xiao Yunxi to be dissatisfied with just putting it on hold. At the suggestion of her maid Qingwen, she decided to hold a wedding ceremony and forced Qin Feiyang to attend in order to publicly humiliate her. Qin Feiyang, who was secretly angry about this, unexpectedly saw the princess bathing and was moved, deciding to marry Princess Linglong. The next day, Zheng Feng brought news of the marriage ceremony, followed by the imperial edict from Wu Yeda and the Sixth Prince. However, Qin Feiyang had already known about it. After learning about the music theory of the first round of competition, he pondered and asked Zheng Feng to prepare tools to create a new musical instrument. At the upcoming wedding ceremony, Qin Feiyang and Zheng Feng brought their new instruments to the final stage, arousing the curiosity of Xiao Yunxi and the Sixth Prince. As the first round began, Tao Muqing and Zhou Heng appeared to play one after another, but unexpectedly it was Qian Tai's turn. He boasted about bringing the guzheng to pass the level by offering a treasure. Qin Feiyang couldn't bear it and drove him away. He confidently played a new instrument guitar, which fascinated Xiao Yunxi. He asked for the instrument and score on the spot, and Qin Feiyang's heartfelt confession made her heart flutter. In the second round, Xiao Yunxi posed questions on site and selected poetry, calligraphy, and painting to depict himself. Zhou Heng and Tao Muqing went on stage to recite poetry and paint, but Qin Feiyang despised their vulgarity and confidently went on stage to write poetry. Unexpectedly, Qian Tai came to jump the queue to recite poetry, but due to incomplete memorization, everyone burst into laughter. Later, Qin Feiyang displayed calligraphy and recited poetry, which made Xiao Yunxi feel embarrassed. Although he did not make a decision on the spot, the Sixth Prince secretly congratulated Qin Feiyang for bringing back the beautiful woman. However, Zhou Heng was unwilling to give up and left with harsh words. Shortly after, Zheng Feng informed Princess Linglong that she had contracted a serious illness. Qin Feiyang immediately rushed to the princess's mansion, but was stopped by Zhou Heng outside. Qin Feiyang stormed in with a domineering aura. After entering the house, Qin Feiyang inquired about the condition and saw that the imperial physician Magpie and Zhou Heng's doctor couldn't make a judgment. He immediately took out a silver needle and ignored Magpie and the doctor's ridicule on the side, diagnosing and treating Xiao Yunxi. Half an hour later, Qin Feiyang woke her up, shocking the two of them. Zhou Heng was angry when he learned about it and came up with another plan. Soon there was news in the palace that Zhou Heng and his father Zhou Rongzheng offered five scattered stones to the emperor, hoping to marry Princess Linglong. Qin Feiyang entered the palace in shock and suspicion, and met with the emperor during Zhou Heng's offering. He publicly revealed that Wu Shi San was a poison and directly revealed its formula as evidence. Zhou Heng and his father were immediately frightened and knelt down begging for mercy. In the end, the emperor ordered the imperial hospital to examine the prescription and dismiss everyone. A day later, the announcement of the candidate for the son-in-law began. However, Zhou Rongzheng and the Third Prince joined forces to protest and pointed out the tragedy at the Zhenbei Wangfu five years ago. Fortunately, the emperor overcame public opinion and announced that Qin Feiyang would enter the Princess's Mansion. Shortly after, after a simple wedding, Qin Feiyang was about to go to the bridal chamber, but unexpectedly had to pass Xiao Yunxi's exam. Fortunately, he passionately confessed and won his wife's favor, passing the exam. But later that night, when Qin Feiyang asked Zheng Feng about the progress of his investigation into the tragedy five years ago, he was unexpectedly assassinated by two assassins. Fortunately, Zheng Feng was skilled in martial arts and killed the assassins, from which letters and silver tickets were found. Zheng Feng used this to discover that Qian Tai had hired a murderer. Upon learning that he was entertaining a friend in the Red Dust Pavilion, Qin Feiyang angrily took Zheng Feng and publicly beat Qian Tai to death, attracting the attention of the courtesan Liu Shishi. Qian Tailai angrily reported to the imperial court, and Qin Feiyang was taken to the palace by the Third Prince for confrontation. Faced with the emperor's questioning, Qin Feiyang admitted calmly and then revealed the truth of his hired murder. However, Qian Tailai was afraid and questioned the forgery of the letter. Zhou Rong was supporting him on the side, making it difficult for the emperor to make a judgment. At the proposal of the Sixth Prince, Qin Feiyang accepted to be responsible for a fundraising of one million taels within ten days. The Sixth Prince later informed that it was to find evidence of the Zhou and Qian families enriching themselves, and felt that fundraising was not easy. However, Qin Feiyang expressed confidence. Just a few days later, Qin Feiyang developed a sky blue silk for auction, instantly causing a craze throughout the city, and handed over the fabric production method to the Ministry of Works for mass production, easily gathering one hundred taels. Soon, the Sixth Prince brought good news about the exposure of the Zhou and Qian families, and was arranged by the emperor to search their homes. Suddenly, Zheng Feng informed Qin Feiyang that the tragedy five years ago was related to Liu Shishi. That night, Qin Feiyang and Zheng Feng once again entered the Red Dust Pavilion and met Liu Shishi for a poetry gathering. Qin Feiyang used two famous poems to surpass Tao Muqing and successfully obtained the opportunity to be alone with Liu Shishi. Unexpectedly, just as Qin Feiyang was about to inquire about the clues of the tragedy, someone secretly drugged Liu Shishi. Then, Magpies and their men broke in to capture him. Fortunately, Zheng Feng drove everyone out in time, allowing Qin Feiyang to detoxify Liu Shishi. When the Sixth Prince and Xiao Yunxi came to arrest the traitor, Liu Shishi was able to prove Qin Feiyang's innocence. Two days later, due to the emperor's sudden illness, the sixth prince rushed Qin Feiyang to be cured, but the third prince drove him away. Magpie was confident that he could cure the disease. However, Qin Feiyang revealed that the emperor was poisoned after diagnosis, and used acupuncture and moxibustion to detoxify on the spot, making the third prince leave in dismay. A few days later, the Third Prince recommended the Ninth Prince to the Emperor to rush to the northern border. However, Qin Feiyang knew that the Third Prince was using a knife to kill someone in order to compete for the throne, so he intervened to stop him and claimed that he could develop stronger siege weapons. The Emperor allowed this, and after a period of time, Qin Feiyang demonstrated the power of artillery, shocking the Emperor and others. The Third Prince looked at him in frustration. Due to the flood disaster in the southeastern province, the Ninth Prince urgently sought advice from Qin Feiyang. After thinking about it, Qin Feiyang asked Zheng Feng to prepare. When he met the emperor, Qin Feiyang presented a small cement water channel and proposed the method of "using work to replace relief", which shocked the emperor and the Ninth Prince. The Third Prince intended to refute but was scolded by the emperor and could only leave in anger. In order to investigate the Qin family tragedy, Qin Feiyang went to the Red Dust Pavilion again and unexpectedly discovered that the Third Prince was threatening Liu Shishi and deliberately scaring him away. Qin Feiyang asked Liu Shishi for clues, but Liu Shishi refused due to safety concerns and had no choice but to leave. One month later, due to the effectiveness of artillery and cement, the emperor rewarded Qin Feiyang with the "Phoenix Habitat". As it could avoid any punishment once, Qin Feiyang decided to give it to Liu Shishi to relieve her concerns. Therefore, Qin Feiyang was punished by Xiao Yunxi by kneeling on the washboard. On the day of the lantern festival, Qin Feiyang accompanied Xiao Yunxi to participate. Qin Feiyang surprised Xiao Yunxi by guessing lantern riddles. Later, he met the Sixth Prince and asked him to help take Xiao Yunxi to appreciate the lanterns. He also invited Liu Shishi to join him and solve the riddle in public, and was invited upstairs. Just as Liu Shishi was about to reveal the truth behind the Qin family tragedy, the assassin secretly shot at her, so Qin Feiyang promptly blocked her with his shoulder. Liu Shishi was moved to reveal the truth and handed over the bloody letter. A few days later, in the palace, Qin Feiyang sought justice for the Qin family massacre that year. He used blood stained letters to expose that the Minister of War had tampered with imperial edicts and forced his father to death. Later, he asked his father, Wang Dahai, to testify and expose the involvement of the Third Prince, which angered the emperor. After a period of time, the sixth prince brought the imperial decree and informed the Minister of War that the entire family would be executed in the autumn. The third prince was sent to the north, which made Qin Feiyang proud to avenge the Qin family with blood. Half a year later, Xiao Yunxi gave birth to a baby, and Qin Feiyang was delighted to become a father