Ruler - Master of the Mask Episode 25

As everyone falls, the king moves Ga-eun to a detached palace and calls Woo Bo to heal.

Prince is unable to enter because of the king's orders and is worried outside.

Ga-eun finds Chun-soo while sick, and the king gets angry by hearing that and goes out. 

While the king is away, the prince meets Ga-eun and the two comfort each other. She says to the prince his title changes every time, but she is thankful for him always staying with her when it is difficult.

The Pyunsoo group and the Prince people find out that this is the work of Queen Mother. Pyunsoo group struggles to lose their judges in the selection, and Hwa-gun participates in the competition as Master Pyunsoo, asking Ga-eun a question to remind her of her father's death.

The king prepares gifts in yellow to comfort her, and Ga-eun is surprised that he knows her favorite color. 

Hwa-gun meets the prince at the palace and says that this is not the work of the Pyunsoo group. The prince is grateful that she has helped him, but cannot meet again as he can not go with Pyunsoo. Hwa-gun confesses that she loves the prince, that she has saved him and has become Master Pyunsoo for him.

Through the confession of Hwa-gun, Prince finds out that the one who tried to kill him was Queen Mother, not Dae Mok. Prince, however, will still continue to help the Queen Mother to stop Pyunsoo.

Dae Mok takes Ga-eun as the suspect of this poisoning case to curb the Queen Mother.