Dong-hyun is a high school student. One day, he falls from the rooftop and bumps into Pan-soo who is a passerby. Pan-soo is a member of a criminal organization. When the two men wake up in the hospital, they discover that they have switched bodies.

In a world where an AI programme allows people to communicate with their deceased loved ones, a flight attendant and a mother question the meaning of reality and humanity.

Donghyun, who works at a real estate office, is surrounded by angry customers due to his boss' disappearance after the greenbelt revocation plan has been cancelled on the land they purchased.

A serial killer reappears 15 years after his murder spree with a book detailing his crimes. The resentful cop who failed to catch him before is assigned to protect him. The families of the victims plan revenge. And as the media circus spirals out of control, a masked man called "J" appears claiming to be the real killer.

Four friends bound by destiny and unbeatable in the dark world. When a casino attack goes wrong as a result of betrayal, fate turns them into enemies. Now, forced to aim the gun at each other's hearts, their unavoidable battle begins.

Four female friends reunite after 15 years and old resentments resurface. Soon afterwards, one of them is found dead. The police tries to determine whether it was suicide or murder.

A timid art therapist falls in love with a spunky kindergarten teacher, helping him overcome his fear of the dark.

Ki Tae finds out that he only has a few months to live. With his remaining time, he sets out to find out what happened to the woman he loved years ago.