16 episodes · first aired 2020-04-17
| Still | # | Title | Overview | Air date | Rating |
|---|---|---|---|---|---|
 | 01 | Episode 1 2020-04-17 | 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. | 2020-04-17 | 8.9 |
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Ratings shown are community scores. Once OMDB is wired, these become per-episode IMDB values.
| 02 |
Episode 2 2020-04-18 |
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. |
| 2020-04-18 |
| 8.5 |
 | 03 | Episode 3 2020-04-24 | 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. | 2020-04-24 | 7.8 |
 | 04 | Episode 4 2020-04-25 | 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. | 2020-04-25 | 9.5 |
 | 05 | Episode 5 2020-05-01 | 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. | 2020-05-01 | 8.8 |
 | 06 | Episode 6 2020-05-02 | 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. | 2020-05-02 | 8.7 |
 | 07 | Episode 7 2020-05-08 | 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. | 2020-05-08 | 7.6 |
 | 08 | Episode 8 2020-05-09 | In Corea, Luna is set free. In Korea, Gon and Yeong run into a man who recognizes them, and Sin-jae experiences childhood flashbacks. | 2020-05-09 | 9.0 |
 | 09 | Episode 9 2020-05-15 | 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. | 2020-05-15 | 9.5 |
 | 10 | Episode 10 2020-05-16 | 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. | 2020-05-16 | 9.0 |
 | 11 | Episode 11 2020-05-22 | 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. | 2020-05-22 | 9.5 |
 | 12 | Episode 12 2020-05-23 | Frightening circumstances land Tae-eul back in Gon's arms. When Yeong runs into a woman who looks strikingly familiar, he follows her. | 2020-05-23 | 9.8 |
 | 13 | Episode 13 2020-05-30 | 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. | 2020-05-30 | 0.0 |
 | 14 | Episode 14 2020-06-05 | 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. | 2020-06-05 | 8.5 |
 | 15 | Episode 15 2020-06-06 | 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. | 2020-06-06 | 8.0 |
 | 16 | Episode 16 2020-06-12 | 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. | 2020-06-12 | 7.5 |
