Secret Door

Twenty years into his reign, a drunk King Yeongjo contemplates as he sits on the floor of his own throne room, dependent on a blind man and legally bound; a fire breaks out and ten years later, that blind man reappears.

As the Crown Prince asks for reconsideration from the King, the palace's loyalists support Lee Sun's request from King Yeongjo by banging their heads against the floor; one of the ministers gives himself a concussion.

The Crown Prince learns Shin Heung Bok committed suicide; King Yeongjo watches the prince in action, and thinks his son does his job well; Lee Sun feels shocked that the cause of death was suicide to slander the royals.

Heo Jung Woon, a suspected accomplice in Shin Heung Bok's death, gets arrested by the royal guards; as the Crown Price finds out about this, he demands the suspected criminal receive fair treatment until proven guilty.

The Crown Prince learns of the arrow's origin from Goongisi, the Joseon Government Office that manufactures weapons; his intel suspects a plot of stolen government weapons to mislead the Crown Prince and the palace.