The Princess Royal

Princess Royal Li Rong and Prime Minister Pei Wen Xuan are husband and wife, but they're not in a harmonious state. They also have different political views. Emperor Li Chuan of the Great Xia is in danger of death due to elixir poisoning, and it's urgent to appoint a crown prince. Li Rong advocates that the son of Empress Shangguan Ya be the crown prince, while Pei Wen Xuan insists on supporting the son of Concubine Qin Zhen Zhen to inherit the throne. The two, who have been living separately, will be at loggerheads again because of this matter when they meet.

Returning to her 18-year-old self, Li Rong intends to use the Spring Banquet to choose a prince consort again. Despite her previous entanglements with Pei Wen Xuan, she now sees him as nothing more than an inexperienced young man under 20. Thus, she plans to tease him a little for her amusement.

Li Rong and Pei Wen Xuan test each other and arrive at the same conclusion, the other person has also come back in time. Both of them stop hiding their pasts and think there is no need to repeat their past mistakes. Pei Wen Xuan no longer suggests being the prince consort and even explains the best prince consort candidate to Li Rong.

The next morning, Li Chuan and Su Rong Qing, who serves as the Vice Minister of Justice, lead a group of men to find Li Rong and Pei Wen Xuan. Just having learned that the one who killed her was Su Rong Qing, Li Rong feels a mix of guilt and conflicted emotions upon seeing him again.

Pei Wen Xuan has just left Qionghua Palace when he is summoned to the Imperial Study by Li Ming. Yang Quan is already waiting there, his eyes burning with envy at the sight of Pei Wen Xuan. Despite Pei Wen Xuan's sarcastic remarks, Yang Quan has no choice but to implore Li Ming to grant his marriage to Li Rong. However, Li Ming remains indifferent.

Pei Wen Xuan takes advantage of the situation to file a report on Yang Quan to Li Ming. After Yang Quan fails to kidnap the princess, he assassinates a court official. Moreover, he continues to get defeated on the northwest battlefield. Wen Xuan voices out that there's something fishy going on. Li Ming takes that opportunity to promote Pei Wen Xuan to a censor and asks him to investigate the Yang family.

Li Rong and Pei Wen Xuan argue frequently, their bickering a daily occurrence, yet they exhibit perfect harmony when it comes to strategy. While investigating the Yang family, they simultaneously begin amassing military strength for the crown prince. In a display of tacit understanding, they temporarily set aside their past grievances involving Qin Zhen Zhen and travel together to Jiulu Mountain, seeking to enlist the help of Qin Zhen Zhen’s brother, the brave General Qin Lin, who has been living in seclusion in the mountains.

After Li Rong is imprisoned, Liu Chuan visits her in prison. A lady was following him. It turns out that the lady is Qin Zhen Zhen. Pei Wen Xuan thought that Qin Zhen Zhen canceled the marriage because her family forced her to do so. However, Qin Zhen Zhen says that she did so of her own accord.

To promote Prince Su, Li Ming decides to send Consort Rou's brother, Xiao Su, to the frontline to replace Li Chuan. A day before the wedding, Pei Wen Xuan hands out red envelopes to other officials. And Su Rong Qing shows up unexpectedly.

On their wedding night, Li Rong and Pei Wen Xuan can't sleep well. Instead, they discuss plans for after their divorce. Pei Wen Xuan deliberately arranges for Su Rong Qing to pick her up during their wedding day, while Li Rong is also thinking about how to stop Qin Zhen Zhen from entering the palace.