Episode 1 - Destiny
November 16, 2016 • 59 minutes
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.
Episode 2 - Meet
November 17, 2016 • 59 minutes
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.
Episode 3 - Find Again
November 23, 2016 • 58 minutes
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.
Episode 4 - Premonition
November 24, 2016 • 58 minutes
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.
Episode 5 - Reduplicate
November 30, 2016 • 58 minutes
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.
Episode 6 - Jealousy
December 1, 2016 • 59 minutes
Sim Chung is involved in a traffic accident. Joon-Jae rushes to the hospital to find her in critical condition.
Episode 7 - Jealousy for Love
December 7, 2016 • 59 minutes
Joon-Jae tells Sim Chung he loves her. Meanwhile, detective Hong comes across Dae-Young while investigating a murder.
Episode 8 - Sincere
December 8, 2016 • 59 minutes
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.
Episode 9 - Reveal
December 14, 2016 • 59 minutes
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.
Episode 10 - Altruism
December 15, 2016 • 59 minutes
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.
Episode 11 - Hurt
December 21, 2016 • 59 minutes
Sim Chung leaves the house after learning Joon-Jae is a conman. In a panic, Joon-Jae desperately searches for her.
Episode 12 - Sweet
December 22, 2016 • 59 minutes
Joon-Jae is arrested by detective Hong. When Sim Chung realizes they are in danger, she tracks them down.
Episode 13 - Episode 13
December 28, 2016 • 59 minutes
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.
Episode 14 - Episode 14
January 4, 2017 • 60 minutes
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.
Episode 15 - Episode 15
January 5, 2017 • 60 minutes
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.
Episode 16 - Episode 16
January 11, 2017 • 61 minutes
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.
Episode 17 - Episode 17
January 12, 2017 • 60 minutes
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.
Episode 18 - Episode 18
January 18, 2017 • 62 minutes
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.
Episode 19 - Episode 19
January 19, 2017 • 60 minutes
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.
Episode 20 - Final
January 25, 2017 • 61 minutes
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...