On the day of Prince Dosung's investiture ceremony, Gun shows up with the real royal seal. He clears his name in front of everyone and finds his place in the palace again. Gun warns the Queen Dowager and Choi Sang Rok that he will carry out an interrogation to disclose who poisoned the King. Choi Sang Rok comes up with a way to save both the Queen Dowager and himself.

The Queen Dowager and Choi Sang Rok fail to leave the palace. Choi decides to kill the Crown Prince as a last resort to keep both the Queen Dowager and Myung Yoon safe. However, his plan fails as Myung Yoon stops him. Meanwhile, the Queen visits the royal taster in her cell and tells her to kill herself.

Myung Yoon finds out about the affair her father has been having with the Queen Dowager and is shocked. Gun and Dosung convince Myung Yoon to leave the capital as she could be in danger, but she insists on staying at her place as she can't abandon her father. Frustrated by Myung Yoon's decision, Moo Baek tells her what her father did to her deceased mother.