A teenage girl is captured by a giant mutated squid-like creature that appears from Seoul's Han River after toxic waste was dumped in it, prompting her family into a frantic search for her.

When a crime organization from North Korea crosses borders and enters South Korean soil, a South Korean detective must cooperate with a North Korean detective to investigate their whereabouts.

A working class family move into a new condo purchased after 11 years of hard work. They throw a housewarming party to show his co-workers when overnight a heavy downpour creates an extremely deep sinkhole that engulfs the entire building.

Activist Kim Min-soo is a fugitive from the law as a result of his political campaigns. As he goes into hiding, he meets and falls in love with Lee Sun-young, a music graduate with plans to study abroad. But not long after, they begin to face obstacles. Because of Min-soo's fugitive status, Sun-young has to cancel her plans to study abroad in order to protect Min-soo. Eventually, the couple elope and Sun-young becomes pregnant, but eventually, the police finds Min-soo and arrests him.

Citizens from upscale Gangnam in Seoul start experiencing unusual and terrifying symptoms, devolving into inhuman creatures, leaving only a few survivors with the possibility to make it out alive.

An oriental doctor Kim Hak-gyu is a cantankerous man who is the longest-term householder in a small village in Seoul. He often causes domestic trouble by being nasty to his wife and his children. Kim Hyeon-ok, a daughter of a young widow who runs Nahana Beauty Shop, is in love with Choi Du-yeol, an obstetrician across the street. Kim Hak-gyu has great distaste for western medicine, and at the same time, is jealous of the obstetrician. He always gets in the way of Choi Du-yeol. Kim's son, Hyeon-gu, dates Jeom-ryae, a daughter of a bar owner.

A young male model twists and manipulates people around him in his unending quest for money and pleasure. He is convinced that he is untouchable and can bend anyone to his will, so not even murder is an obstacle to his ambitions.

Hee-soo is desperate for money and finds her ex-boyfriend who owes her money. He goes around to various ex-girlfriends to get cash and she trails along to make sure he does not cheat her.

In mid '90s, 3 female high school-grad office workers take up English classes together to get promotions and they team up to uncover corruption within their company.

A comic book store in Garibong-dong is run by a beautiful woman better known as Madam. This store stays open late into the night, thus attracting varied types of people such as gangsters and hustlers.

Senior year of high school takes center stage as Lara Jean returns from a family trip to Korea and considers her college plans — with and without Peter.

For the first time in Korean history, the mayor of Seoul attempts a third term in office, with his entire campaign team ready to soil their hands.