Ruler: Master of the Mask Episode 12

Prince urges the wealthy merchants to help small retailers to avoid to be the next target of Yangsu-cheong. Hwa-gun asks what they will get in return. The prince promises to circulate their herbs piling up in stock through peddler's network. They put that in a vote and decide to help small retailers. 

Hwa-gun asks the prince to give more information about Yangsu-cheong in return. She sees the prince meeting with Ga-eun but feels odd the way he treats her. She calls Gon to find out everything about him. 

Moo-ha arranges a meeting with Ga-eun and a doctor in the palace. It is Ga-eun's move to unveil the truth of her father's death. 

King meets his personal guard to hear his family's news. He is grateful to Ga-eun who takes care of his family. He is afraid of Dae Mok to find out about his family and make them as hostages.

Dae Mok receives a report that the head of peddlers help small retailers to pay all the money to Yangsu-cheong. Dae Mok wants to know everything about him. 

Prince visits Woo Bo to consult about Dae Mok's plan. Woo Bo guesses Dae Mok is up to the right to print money because copper is used to produce coins. The prince wants to find a way to secure copper.

Prince visits Hwa-gun again to ask help to get copper. Hwa-gun is happy to see him. She reveals herself, and the prince remembers their meeting at Deputy Magistrate Han's execution. 

Woo Bo suggests having Moo-ha together with them going to the Japan town. Hwa-gun volunteers to help the prince as a guide.  

At the Japan town, there is a rumor that the copper trading ship was attacked by pilots, but Hwa-gun finds out that may be a false info. 

Pince hides as Dae Mok's son enters into the lodging where they were having a meeting. He also pulls Hwa-gun returning from a meeting with Japanese. Prince tells Hwa-gun that that person is Dae Mok's son and he wants to find out his plan here, without knowing Hwa-gun is his daughter.

In the room where Dae Mok's son sleeps, a person in black breaks into and searches for something. While the person looks at the map he receives it earlier in secret, the prince also sneaks into the room. 

The prince fights the person and sees the bracelet she is wearing, noticing that she is the singer he saw earlier.