Prince Lee Hwan receives a cursed letter from a supernatural entity detailing several dark predictions for his future and is horrified to realize that the curses are indeed coming true one by one. Min Jae-yi, on the other hand, finds herself wanted by the local authorities after being unjustly accused of murdering her family members and unilaterally calling off her arranged marriage.
A rumor about how Prince Hwan has been cursed by a ghost has spread throughout the country. He has a dark secret he can't tell anyone. People who are trying to get Hwan dethroned prepare a trap and Hwan must stand against them. Meanwhile, the one who killed Hwan's Master comes to see him of her own free will.
After facing a crisis at the hunting grounds, Hwan finds himself in an unbelievable situation. Jae-yi claims that she's innocent and blames Hwan for the death of her family. Hwan is confused when he finds out Jae-yi knows about his secret. Meanwhile, Jae-yi's servant disguises herself as a man to learn from the mad scientist, Kim Myeong-jin.
Hwan can't trust Jae-yi and tells her to come find him in the East Palace on her own. To get there, Jae-yi turns herself into a eunuch. Meanwhile, Seong-on is shock to learn that his father might have something to do with the written prayer incident.
Hwan gives Jae-yi a second test. She must figure out why the messenger he sent to Master Min's house was killed and Jae-yi finds out it has something to do with Hwan. And finally, Hwan gives the last test which is to solve a serial murdercase. Now Jae-yi must face her fiancé.
Hwan, Jae-yi, Myeong-jin and Ga-ram finally meet. They head out to solve the Cardinal Point case. Meanwhile, Seong-on feels humiliated since he's competing against Sun-dol and feels upset when he sees Hwan and Sun-dol together.
Jae-yi proves herself by solving the Cardial Point case and Hwan starts to trust her. Hwan listens to what happened to Jae-yi's family and trusts that she is innocent. Seong-on and Jae-yi run into each other by accident and she finds out Seong-on has been carrying something that has something to do with her.
After Hwan decides that he can't trust Jae-yi, he kicks her out of the palace. Ga-ram is ordered a chusoeryeong and is put in danger. Seong-on is curious as to why Hwan is looking into the case of his ex-fiancé and Hwan feels lonely now more than ever without Jae-yi.
The Prince's Guards and the War Department has a match of polo while Jae-yi watches. The interrogation of the shaman begins and she starts to curse the royal family which brings chaos to the capital and the palace.
The palace and the capital is in chaos after the shaman's curse. Cho Won-bo turns the crisis into an opportunity and starts to pressure the royal family. Hwan and Jae-yi tried to prove that a human set fire to the plum tree and they find out that the real culpirt is someone they didn't expect.
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After finding the royal secretary's journal suspicious, Hwan starts investigating what happened in Byeokcheon and the dried peony petals. After getting a mysterious letter, Cho Won-bo tries to subjugate the remnants of the thieves.
Hwan teams up with Jae-yi and Seong-on to find a way to leave the palace after getting confined. Jae-yi finally remembers the face of the messenger who was at her house and is in shock. She runs to Hwan after realizing he's in danger.
Jae-yi claims that her memories are true, but Hwan trusts Tae-kang which confuses Jae-yi even more. Meanwhile, to each Myung-jin a lesson, Ga-ram steps up. Hwan leaves with Jae-yi and Seong-on after finding the man who tampered with the written prayer is in Paju and get themselves in danger.
After returning to the palace, Hwan tries to send Jae-yi to Seong-on because he doesn't want Jae-yi to get hurt anymore. Meanwhile, a mysterious woman comes to Seong-on's house. The bounty hunters go to Jo Won-bo about Ga-ram and while having a good time at the inn, Hwan, Jae-yi, Myung-jin and Ga-ram are faced with another murder case.
The Manyeondang group manages to get the bracelet Shim Yeong gave to Jae-yi and start to figure out how Jae-yi's family was murdered. The King announces that the Crown Princess selection will take place soon, so Hwan gets ready to let Jae-yi go. Meanwhile, Prince Myeong-han, who was suffering from nightmares, says something shocking.
The Queen is furious that Won-bo used her son, Prince Myeong-ahn. Hwan tries to meet Park Han-su to find out what happened in Byeokcheon, but Jo Won-bo makes a move first to stop him from talking. Meanwhile, Princess Ha-yeon makes a risky decision to help Prince Myeong-ahn get better and the Manyeongdang group takes a huge step toward the truth.
Princess Ha-yeon and Prince Myeong-ahn leaves the palace to meet Monk Mu-jin and an assassin follows them. Hwan and Jae-yi ask Tae-kang about the new mystery they unfolded, but Tae-kang says he doesn't know anything about it. Meanwhile, the Queen tells Seong-on the truth about Jae-yi and Jae-yi finds herself in danger.
Seong-on finds out Sun-dol is acutally Min Jae-yi and feels betrayed. Meanwhile, Tae-kang tells Hwan everything about his secret. Hwan, Jae-yi, Myung-jin and Ga-ram takes one step closer to the truth and starts to track down the secret letter Min Ho-seung left behind, but another crisis hits them.
After finding out what's written in the jikgeumdo, Hwan and Han Jung-eon are in shock and Jae-yi gets arrested for murder. Hwan is even more shocked to hear Jae-yi admit everything. Jo Won-bo demands that the Crown Prince gets deposed. Meanwhile, Seong-on gets an order from the Queen in secret.
After finding out about the Queen's secret, Jo Won-bo is furious and the Queen makes a decision when Won-bo threatens her son. Meanwhile, the six arrive at Naewang Village and Hwan tries to convince them. Just then, Jo Won-bo comes once again to slaughter them.
