Lee Soon, at Jang Hyeon's request to hold an interrogation, tells him to keep his mouth shut in exchange for making him his father-in-law. Meanwhile, the fourth concubine drinks poisoned rice punch and falls unconscious.
Lee Soon appoints Maid Choi to the fourth rank concubine. Meanwhile, Prince Dongpyeong confesses to Lee Soon that he loved Ok Jung.
Ok Jung safely gives birth to a prince. Meanwhile, Lee Soon suddenly falls unconscious.
When a palace maid of the royal kitchen says she will confess who the mastermind is, Inhyeon, Ok Jung, and Lee Soon step into the interrogation ground. Meanwhile, Chi Soo and Lee Soon meet again by chance at the courtesan house, and Chi Soo proposes a deal with Lee Soon.
The Queen Mother tells Ok Jung to promise to give her child to the queen, saying it is the custom of the palace for a concubine's child to be raised by the queen. Meanwhile, Ok Jung finds out Inhyeon is unable to conceive and calls Jang Hyeon to the palace.
Chi Soo asks Min Yu Jung to arrange a meeting with His Highness. Meanwhile, Lee Soon, at Ok Jung asking whether it is alright to have a son, tells her he wants her to give him a son at any cost.
The Queen Mother calls a priestess and sets a day for Inhyeon and Lee Soon to spend the night together. Meanwhile, Chi Soo seeks out Min Yu Jung, saying he wants to pay the Westerners' political funds. He wants only one thing, the head of Jang Hyeon.
Lee Soon rises to the position of the fourth rank concubine. Meanwhile, Min Yu Jung devises a plot to chase Ok Jung out of the palace.
Lee Soon, preparing to spend the night with Inkyeong, hears Hyeonjong is in critical condition and runs to his side. Meanwhile, Ok Jung is advised by Jo Sa Seok, who has come to Buyongjeong, to try and become a court lady.
Lee Soon finds out Ok Jung intends to make armor and lets her watch the military training. Meanwhile, Ok Jung encounters bandits, who see Ok Jung leveling her sword and shoot an arrow toward Lee Soon. But Ok Jung complains to Lee Soon all the more.
Ok Jung, through Jang Hyeon's help, is reunited with her long-lost brother Hee Jae. Hee Jae introduces her to Prince Dongpyeong, saying he met him in China. Also, Ok Jung, at Inkyeong's request to chaperone her at the Crown Princess selection, decides to help, saying it's a chance to see palace fashion.
Jang Hyeon went to Buyongjeong to take young Ok Jung with him. But he is disconcerted by Madam Kang's question, do you know my brother? Meanwhile, young Lee Soon, seeing pickpocketers steal from young Ok Jung, gets into a fight while helping her. Ok Jung takes Lee Soon with her and they run away.
Lee Soon receives a letter and ends up meeting Ok Jung. He grows lost in thought, thinking he has seen her face somewhere before. Meanwhile, Ok Jung seeks out Jo Sa Seok's wife and asks him to free her mother. From her uncle, Jang Hyeon, she hears of his dangerous ambition. Ok Jung is the only one who can realize his wish, so how about swallowing Joseon together?
Shin Myeon finds out that Seryeong left to warn Seungyu and attacks with his army, but retreats after Jabeon dies. Seungyu sends Seryeong back to the capital and begins the fight.
Seungyu takes Seryeong to Bingokkwan and decides to take her with him when he leaves with his family. He pursues the plan to kill Suyang. When Seryeong disappears from the palace, Myeon goes to Bingokkwan.
Seungyu tries to break Lee Gae and Jeong Jong out of prison, but they refuse to break out. Seryeong thinks about all the people who are suffering because of her father and cuts off her ties with him.
Seryeong finds out about Seungyu's plan to kill Suyang and she is in conflict. Han Myeonghoe senses there is an assassination attempt and the attempt fails. Myeon goes after Seungyu.
Seryeong brings Seungyu to see his family and becomes installed as the princess. Lee Gae, Jeong Jong and some other scholars plan to assassinate Suyang. Seungyu joins in their cause.
Prince Suyang finally becomes the king. Seryeong is mad and refuses to enter the palace. Seungyu attacks Shin Sukju, but Myeon appears and gets injured instead. Gong Chilgu tells Myeon that someone survived the boat that was headed to Ganghwa.
Seryeong returns home to recover from the arrow wound. She refuses to marry Shin Myeon when she finds out that her father lied again. Shin Myeon contacts Gong Chilgu to find out who abducted Seryeong. Danjong decides to concede the throne to Prince Suyang.