Youth, Climb the Barrier - Season 1

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 one 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. Finally, Hwan gives the last test which is to solve a serial murder case. 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. Jo 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.

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 Gang which confuses Jae Yi even more. Meanwhile, to teach 'Woodpecker' a lesson, Ga Ram steps up. Upon learning that the man who tampered with the written prayer is in Paju, Hwan leaves with Jae Yi and Seong On, but they find 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. A mysterious woman comes to Seong On's house. Bounty hunters go to Cho Won Bo about Ga Ram, and while having a good time at the inn, Hwan, Jae Yi, Myeong Jin and Ga Ram are faced with another murder case.

The Manyeondang group manages to get the bracelet Sim Yeong gave to Jae Yi and starts 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 Cho 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 Gang about the new mystery they unfolded, but Tae Gang 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. 

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. Will Hwan be able to protect the people of Byeokcheon?