After the king died suddenly, the crown prince ordered a thorough investigation into the cause of the king's death, especially Guier, who had a close relationship with the king.The doctor confirmed that the fatal injection came from the needle set used by the king every day, which led to Guier being imprisoned in a secret cell.

Si Zuxian warned everyone in the room that the cause of the king's death must not be revealed until the matter becomes clear.He was puzzled by Guier's betrayal, and at the same time he was guessing who was behind it.

However, Guier firmly denied the murder accusation.Although she was not afraid of death, she felt heartbroken by Si Zuxian's distrust.She admitted that she once had a desire for revenge, but gave up the idea because she missed her ancestors.

On the other hand, Chen Wuda brutally tortured Guier in an attempt to force her to confess.But her tenacity and innocence are touching.Her cries alarm Ergui, who intervenes to try to convince Si Zuxian of Gui'er's innocence.

Ergui reveals that he knows who the real murderer is, but the truth will not be revealed until Si Zuxian is no longer imprisoning him.

Si Zulong's return cast a shadow over the palace.On the surface, he was grieving the king's death, but the truth behind it was shocking.It turned out that it was he who killed the king in an attempt to usurp the throne.

In the end, Si Zuxian successfully rescued Guier and brought her to a mountain cabin.He took good care of her until she woke up.When she opened her eyes, she was surprised to find that the person who saved her was not Si Zuxian, but Ergui.