1. Episode 1

8.9

. 17 April 2020. 73 min

Lee 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.

2. Episode 2

8.9

. 18 April 2020. 73 min

Gon 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.

3. Episode 3

7.8

. 24 April 2020. 72 min

Though 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.

4. Episode 4

9.7

. 25 April 2020. 73 min

When 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.

5. Episode 5

8.8

. 1 May 2020. 73 min

Being 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.

6. Episode 6

8.667

. 2 May 2020. 73 min

A potential military conflict threatens the kingdom. Gon promises Tae-eul he will return to her, and steps forward to take care of the situation.

7. Episode 7

7.6

. 8 May 2020. 73 min

Gon 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.

8. Episode 8

9

. 9 May 2020. 73 min

In Corea, Luna is set free. In Korea, Gon and Yeong run into a man who recognizes them, and Sin-jae experiences childhood flashbacks.

9. Episode 9

9.5

. 15 May 2020. 72 min

Gon 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.

10. Episode 10

9

. 16 May 2020. 73 min

On 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.

11. Episode 11

9.5

. 22 May 2020. 72 min

A 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.

12. Episode 12

9.8

. 23 May 2020. 72 min

Frightening circumstances land Tae-eul back in Gon's arms. When Yeong runs into a woman who looks strikingly familiar, he follows her.

13. Episode 13

0

. 30 May 2020. 73 min

Knowing 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.

14. Episode 14

8.5

. 5 June 2020. 72 min

Gon and Tae-eul are separated when he sets out to fulfill what's been his fate all along. Sin-jae makes a startling discovery.

15. Episode 15

8

. 6 June 2020. 81 min

Lim 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.

16. Episode 16

7.5

. 12 June 2020. 77 min

A final attempt to put a stop to Lim's ambitions comes with profound consequences. Gon travels far and wide in search of Tae-eul.