Episode 19 recap: Zhou Shi Yu was assassinated in the Eastern Yu Kingdom.

Yue Ling was brought to the court by the imperial guards, and the Prime Minister Zhou Jing Yuan produced the palace banquet diagram, pointing out that the princess before them was not the legitimate A Shi Na Zhu, but the illegitimate Yue Ling. The Emperor already knew Yue Ling's true identity and was not surprised to see the banquet diagram. The Southern King thought the person before them was good, and that the distinction between legitimate and illegitimate was not important, while the Northern King believed the original intent of the marriage alliance was to pacify the war between the two kingdoms, and that both were princesses. However, the Prime Minister insisted that the distinction between legitimate and illegitimate was an ancestral rule that could not be violated, and the Emperor agreed, criticizing the Eastern Yu Kingdom for its lack of credibility and ordering troops to conquer it.

Yue Ling mentioned her longing for the Northern Shuo, and the Great Khan was unwilling to let her come for the marriage alliance, so she asked A Shi Na Zhu to cover up for her and take her place in becoming a nun. Therefore, she should not be blamed for this deception, and the Northern King was also unaware of this. The Prime Minister still wanted the Northern King to bear the crime of deceiving the Emperor, but Yue Ling took all the blame upon herself. The Prime Minister insisted on going to war, while the Northern King believed it would take at least a month to pacify the situation, so he proposed to go to the Eastern Yu Kingdom himself.

The Prime Minister was worried that the Northern King would protect Yue Ling, so the Emperor had to imprison Yue Ling in the Princess's Palace for further investigation. After learning of this, Xing Yi prepared a lot of things and decided to go to the Princess's Palace to find someone, even seeking the help of the Northern King, who was about to go to the Eastern Yu Kingdom and invited Xing Yi to accompany him.

That night, the Northern King Zhou Shi Yu entered the Princess's Palace, bringing Yue Ling a bag of food and fur, reminding her to test the food for poison before eating and be very careful. Zhou Shi Yu prepared to go to the Eastern Yu Kingdom, leaving Lin Mu behind to take care of Yue Ling and placing his own people in the Princess's Palace. Zhou Shi Yu had made arrangements at various relay stations and horses ready.

At the same time, the Prime Minister Zhou Jing Yuan also had his people prepare, allowing the Northern King to enter the Eastern Yu Kingdom's territory and then making a move, using it as an excuse to attack the Eastern Yu Kingdom. The Southern King had no appetite for the delicious food and was envious of the affectionate relationship between the Northern King and his wife, wishing someone would be as devoted to him as Yue Ling.

However, Yang Xu believed that this was a turbulent time and an opportunity to get rid of Zhou Shi Yu. The Southern King did not expect Yang Xu to be such an opportunistic scoundrel and reminded him not to kick someone when they were down.

Su Nian felt very depressed because he was just ordered to kill Xing Yi, so he drank to drown his sorrows. Ling Xi told Su Nian that the Northern King was heading to Dongyu, and Xing Yi was accompanying him.

Xing Yi brought the Northern King to Dongyu. Since Yue Ling and Xing Yi had run away together, Xing Yi went into the camp ahead of time to apologize to his father the Khan. It turned out the Khan already knew about Yue Ling's impending marriage, and had already found Du'er and A Shi Na Zhu.

The Northern King waited outside the camp, awaiting the Khan's summons. The Khan was unwilling to see the marriage with Yue Ling go through, but seeing the Northern King waiting outside for so long showed his sincerity, so the Khan allowed him to enter the camp. The Northern King not only refused to call off the wedding, but also hoped the Khan would write up an official marriage document to formalize the union. Zhou Shi Yu brought the marriage document back to the princess's residence to find Yue Ling. Yue Ling and Zhou Shi Yu joyfully embraced, finally able to be together openly. But as soon as they opened the door, Zhou Shi Yu was stabbed to death.

It turned out this was all just a dream of Yue Ling's, and she woke up in a cold sweat. The Northern King, Zhou Shi Yu, and the others returned with the marriage document, but were ambushed on the way, and the Northern King was assassinated. Soon after, the emperor also received news that the Northern King had been attacked and killed in Dongyu.

Hearing the news from the guards, Yue Ling remembered her past with the Northern King. Holding the jade pendant, she couldn't stop the tears from flowing.