Pianist Sara arrives in the city of Seoul as an exchange professor. She can't see the sad loneliness of the city. Sarah enjoys her time as a well-to-do tourist. Others, born in the city, fight against loneliness and sorrow. Illegal workers are exploited and cops extort money from adult entertainment establishments. Among these, gang member Il-Hwan collects money from room-salons for protection. Deok-Sang drives a tourist bus instead of his father and Ji-Won sells food items by a station. These three people become connected.

A beautiful workaholic is fired from her job as a marketing executive for a children's toy company. With her life spinning out of control she teams up with her neighbour, who owns a sex shop, to design and promote better sex toys.

Young-goon, mentally deranged and frequently electro-charging herself with a transistor radio, has been admitted into a mental institution. Firmly believing herself to be a cyborg, she refuses to consume like a human being. Il-soon is another patient, who catches the eye of Young-goon and soon becomes a close friend. Il-soon is now confronted with the biggest task: to cure Young-goon's mental problem and have her eat real food.

A North Korean refugee, Jung-Nim, is trying to find a new life in South Korea, with people suspecting that she is a spy.

Oh Sung-Chul has been released on parole. He wears an ankle bracelet that monitors his movements as well as reminding himself of his horrifying past deeds. Sung-Chul lives in an apartment complex about to be demolished. He loses his construction job and is screwed over for half of his last paycheck. He takes medication to suppress his urges. Kim Hyung-Do is a religious family man who runs a printing company. The printing business is going through hard times. Kim Hyung-Do also goes through heavy emotional turmoil due to a horrendous crime inflicted upon his daughter by Oh Sung-Chul. On a fateful day, Hyung-Do spots Sung-Chul out on the street.