Episode 1Lee Gon mourns the tragic death of his father. Lee Lim goes on the run — and finds escape when he comes across a door to a parallel universe.
Episode 2
E2
Episode 2Gon insists he is an emperor from another world. An incredulous Jeong Tae-eul takes him to the police station, where he sees a familiar face.
Episode 3
E3
Episode 3Though Tae-eul finds Gon's story difficult to believe, some things about him are completely inexplicable. At work, she gets busy with a murder case.
Episode 4
E4
Episode 4When Tae-eul loses her police badge, she can't help but think about Gon. Meanwhile, Kang Sin-jae has had it with his mother's bad habits.
Episode 5
E5
Episode 5Being introduced to Gon's world is a lot to process for Tae-eul, who's taken to the palace. A disgruntled Jo Yeong keeps an eye on her.
Episode 6
E6
Episode 6A potential military conflict threatens the kingdom. Gon promises Tae-eul he will return to her, and steps forward to take care of the situation.
Episode 7
E7
Episode 7Gon brings Yeong along on his trip back to Tae-eul. He has a favor to ask of her, while she's found something troubling to share with him.
Episode 8
E8
Episode 8In Corea, Luna is set free. In Korea, Gon and Yeong run into a man who recognizes them, and Sin-jae experiences childhood flashbacks.
Episode 9
E9
Episode 9Gon draws closer to tracking down Lim, and asks Jo Eun-sup to trade places with Yeong. Mail from an unknown sender bothers Koo Seo-ryeong.
Episode 10
E10
Episode 10On Lunar New Year, Gon and Lim come face-to-face in a public standoff. Tae-eul opens up to Sin-jae about the other world and her ongoing case.
Episode 11
E11
Episode 11A compelling offer finds its way to Luna. Gon's investigation into a devastating murder leads him to an old traitor and a clearer idea of Lim's schemes.
Episode 12
E12
Episode 12Frightening circumstances land Tae-eul back in Gon's arms. When Yeong runs into a woman who looks strikingly familiar, he follows her.
Episode 13
E13
Episode 13Knowing Seo-ryeong is up to no good, Gon throws her in a tight spot. Upon returning to her world, Tae-eul realizes Luna is there, too.
Episode 14
E14
Episode 14Gon and Tae-eul are separated when he sets out to fulfill what's been his fate all along. Sin-jae makes a startling discovery.
Episode 15
E15
Episode 15Lim plots his next meeting with Gon. Understanding there's only one thing he can do to right wrongs, Gon comes to a heart-wrenching decision.
Episode 16
E16
Episode 16A final attempt to put a stop to Lim's ambitions comes with profound consequences. Gon travels far and wide in search of Tae-eul.
Cast of Season 1
Lee Min-hoLee Gon
Kim Go-eunJung Tae-eul / Luna
Woo Do-hwanJo Eun-sup / Jo-young
Kim Kyung-namKang Shin-jae
Jung Eun-chaeGoo Seo-ryung / Goo Eun-ah
Lee Jung-jinLee Rim
Jeon Moo-songLee Jong-in / Prince Boo-young
Kim Yeong-okNoh Ok-nam
Jeon Bae-sooJung Do-in
Seo Jeong-yeonSong Jung-hye
Park Won-sangPark Moon-shik
Park So-jinJo Hae-in
Baek Hyun-jooLee Gon's Secretary
Kang Hong-sukJang Michael / Jang Mi-reuk
Kim Yong-jiMyung Na-ri / Myung Seung-ah
Lee Hong-naeSeok Ho-pil
An Si-haKim Hee-joo
Choi Woo-sungKim Ki-won
Jung Hyeon-junYoung Lee Gon / Lee Ji-hun
Kim Shi WooYoung Jung Tae-eul
Moon Woo-jinYoung Shin-jae / Kang Hyun-min
Noreen Joyce GuerraMoon Seung-ih
Lee Hae-yeongYoo Kyung-moo
Yoon Ju-manYoung Yoo Kyung-moo
Hwang Young-heeMin Hwa-yun / Park Sook-jin
Ryu Sung-rokKyu-bong
Heo Dong-wonDetective Shim
Song Sang-eunKyung-ran
Hwang Se-onPark In-young
Shin Hyeon-jongLee Jung-hoon
Lee Hwang-euiPrime Minster's Adviser
Kang Ki-doongSecretary Kim
Jang Hae-minPrime Minster's Staff
Kim Jung-youngKim Sung-ae
Baek Sang-HoonDirector
Jung Jee-hyunDirector
Yu Je-wonDirector
Kim Eun-sookWriter
Jinnie ChoiProducer
Yoon Ha-limProducer
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