Based on an original written by Cheon Myeong-gwan, a 48 year-old movie director moves into the house where his mother and 50 year-old brother lives until his sister moves in with her niece.

One day, 25 years ago, missing Chun-bae's letter is delivered to his cousin, Jjang-goo. The letter contains Chun-bae's lover, Bok-soon, and other people's letters. Jjang-goo finds Bok-soon to deliver the letter and meets class president Jang together. The three people recall their memories from 25 years ago, and eventually faced the person who sent the letter. Through that, the tangles begin to unravel.

Ha Yoon-ju becomes the newest member of a unit within the Korean Police Forces Special Crime Department that specializes in surveillance activities on high-profile criminals. She teams up with Hwang Sang-jun, the veteran leader of the unit, and tries to track down James who is the cold-hearted leader of an armed criminal organization.

May, 1980. Man-seob is a taxi driver in Seoul who lives from hand to mouth, raising his young daughter alone. One day, he hears that there is a foreigner who will pay big money for a drive down to Gwangju city. Not knowing that he’s a German journalist with a hidden agenda, Man-seob takes the job.

A man in his late thirties sees his friends moving away from him more and more because of the responsibilities that come with entering adulthood, while he studies poetry and wonders if it is worthwhile to follow his relationship or settle his head and find a stable job.

A young man finds out that he is living a completely identical life to another man who lived decades ago. And when his wife is murdered the same way as the previous man's, he decides to dig into the older case to find clues about who was the murderer this time.

The story begins with a man left by his girlfriend on Christmas Eve and unfolds across the city of Seoul.

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.

Dreaming of a box-office hit, an adult-movie director teams up with his crew of three misfits to lure a top actress into starring in his new film.

Sung-geun is an untalented actor who makes a living playing minor roles. He happens to land on the role as Kim Il-sung, the former leader of North Korea, for the rehearsal of the South-North Korea Summit. Sung-geun becomes passionately immersed in his role, motivated by his son who looks up to him. However, the summit is not realized, and Sung-geun ends up lost in the delusion that he really is Kim Il-sung.