A mermaid from the Joseon period ends up in present-day Seoul, where she crosses paths with a swindler who may have ties to someone from her past.

Nanotechnology researcher Wang Miao is taken to the Joint Operations Center by police officer Shi Qiang, who's investigating the mysterious suicide wave among scientists worldwide, and recruited to sneak into an organization called the Frontiers of Science to help the investigation. When Wang Miao is contacted by the leader of the organization, Shen Yufei, she introduces him to a sophisticated VR video game called Three-Body, but soon he discovers that it's more than just a game.

Faruk is the owner of a bus company and the leader of a powerful family in Bursa which is a metropol in Turkey. Faruk meets a violonist girl and falls in love with her. But the dominant mother of Faruk isn't happy with her son's relationship.

Cha Dohyeon is a rich heir to a family company with one major problem. Due to suppressed childhood trauma, he suffers from dissociative identity disorder manifested in seven unique personalities who are out of his control. In order to overcome this disorder in secret, he hires a first-year medical resident to help him heal by killing off each personality one by one.

Kang Ji-won, a terminally ill cancer patient, is killed by her husband and best friend after she witnesses them having an affair. She wakes up 10 years before the incident and decides to seek revenge with the help of Yu Ji-hyuk, a director at the company where she works. Now, she must reclaim her fate and eliminate the trash from her life.

The top 0.01% of students control law and order at Jooshin High School, but a secretive transfer student chips a crack in their indomitable world.