1. Destiny

7.7

. 16 November 2016. 59 min

In 1958, the nobleman Dam-Ryung releases a mermaid back into the ocean. In present-day Seoul, the figure of conman Joon-Jae stands on the same spot.

2. Meet

6.8

. 17 November 2016. 59 min

Joon-Jae brings a beautiful woman back to his hotel, unaware that she's a mermaid. Jin-Ok realizes she's been scammed and sends men after Joon-Jae.

3. Find Again

9.8

. 23 November 2016. 58 min

With no memory, Joon-Jae finds himself alone on a beach next to a jade bracelet and a single pearl. Meanwhile, the mermaid crosses the ocean to Seoul.

4. Premonition

10

. 24 November 2016. 58 min

At the aquarium, Joon-Jae runs into a woman being chased by security. Feeling a sense of déjà vu, Joon-Jae rescues her and brings her home.

5. Reduplicate

10

. 30 November 2016. 58 min

Joon-Jae lives with the woman who he names Sim Chung. Fugitive Dae-Young has been on the run for 3 months when a murder occurs near Joon-Jae's house.

6. Jealousy

10

. 1 December 2016. 59 min

Sim Chung is involved in a traffic accident. Joon-Jae rushes to the hospital to find her in critical condition.

7. Jealousy for Love

10

. 7 December 2016. 59 min

Joon-Jae tells Sim Chung he loves her. Meanwhile, detective Hong comes across Dae-Young while investigating a murder.

8. Sincere

10

. 8 December 2016. 59 min

Jung-Hoon teaches Sim Chung that jealousy is the way to a man's heart. Meanwhile, Joon-Jae sees an image of a man with a mermaid on an ancient vase.

9. Reveal

10

. 14 December 2016. 59 min

Joon-Jae finally faces off with his pursuer Dae-Young. He suffers a major injury and confesses his feelings to Sim Chung before losing consciousness.

10. Altruism

10

. 15 December 2016. 59 min

In a museum, Joon-Jae sees a figure in a painting that looks just like him. Unable to identify the figure as Dam-Ryung, he grows distraught.

11. Hurt

10

. 21 December 2016. 59 min

Sim Chung leaves the house after learning Joon-Jae is a conman. In a panic, Joon-Jae desperately searches for her.

12. Sweet

10

. 22 December 2016. 59 min

Joon-Jae is arrested by detective Hong. When Sim Chung realizes they are in danger, she tracks them down.

13. Episode 13

10

. 28 December 2016. 59 min

Joon-Jae is still having strange dreams. Sim Chung hears Joon-Jae say the name Se-Hwa in his sleep. She asks him who he is talking about.

14. Episode 14

5.5

. 4 January 2017. 60 min

With Professor Jin's help, Joon-Jae learns he is an ancestor of Dam-Ryung. To avoid a tragic fate, he decides to protect Sim Chung whatever it takes.

15. Episode 15

7.2

. 5 January 2017. 60 min

Sim Chung's heart will stop without Joon-Jae's love. Upon learning this, Joon-Jae talks about his dreams and finding out that Sim Chung is a mermaid.

16. Episode 16

10

. 11 January 2017. 61 min

Joon-Jae and Yoo-Ran have an emotional reunion at Sim Chung's birthday party. Joon-Jae learns why Dae-Young has been chasing him.

17. Episode 17

8.5

. 12 January 2017. 60 min

After almost being caught by Dae-Young, Sim Chung erases his memory. In the process, she witnesses the final moments of Dam-Ryung and Se-Hwa.

18. Episode 18

10

. 18 January 2017. 62 min

After Il-Joong's death, detective Hong gets a warrant to search Seo-Hee for evidence. Meanwhile, Chi-Hyun threatens Nam-Doo to get him to cooperate.

19. Episode 19

10

. 19 January 2017. 60 min

Chi-Hyun points a gun at Joon-Jae, but Sim Chung jumps in front and is shot. She slips into a coma, causing Joon-Jae to fall into despair.

20. Final

10

. 25 January 2017. 61 min

Sim Chung erases Joon-Jae's memory and returns to the ocean. When Joon-Jae wakes up, there's only a single pearl next to him. Three years pass...