Chinese secret agent Da-hee receives intel that a large number of illegal firearms are being smuggled into Korea and is sent to investigate the case. She meets Su-han, who is supposed to help her with the case, but due to his lackluster skills they fight over trivial things. But as their witnesses are suddenly murdered, the two of them quickly become the prime suspects.

Soo-hyun, who has recently moved into a new house, buys a used washing machine through a second-hand app but finds out it doesn’t work. Annoyed by the seller’s irresponsibility, she leaves a comment calling the seller a con man, and reports it to the police. Little does she know that the seller is a psychopathic serial killer who uses an online second-hand market to lure his victims. Her comment renders his hunt for a new victim all but impossible so she becomes his next target. She starts receiving obscene phone calls, countless unwanted food deliveries, and strange men knocking on her door looking for a good time. A trip to the sender’s address proves deadly serious when the police and Soo-hyun find a man’s dead body.

Residents, who are evicted from their homes in a designated urban renewal, demonstrate against their removal. The police arrive and attempt to end the demonstration. Death happen that lead to the bigger problem.

Detective Cho is incompetent and always fails to be promoted. His only pleasures in life are spying on neighbors who are having affairs or binge drinking. One day, Cho comes across the corpse of what seems to be a child on a nearby mountain and he decides to investigate the case, thinking that this is his last chance to impress his boss. Cho enlists the help of his partner, Detective Lee, and together the two embark upon an investigation that will test their professional judgement. The more they learn about the case, the more they come to suspect that the poverty-stricken father of the dead child is their killer. But the case goes off course when the two begin to sympathize with him.

During the Joseon Dynasty, lowborn Chae-sun challenges the rule that states only men allowed to sing while navigating devotion to her teacher and the demands of the king's father.

Nam-bok, a middle-aged South Korean farmer is conscripted and assigned a mission to deliver a classified military document that may decide the fate of the war. After losing it while under attack from the enemy, he then faces a teenage North Korean soldier named Yeong-gwang who happens to acquire the secret document on his way to the North.

From the Japanese Occupation a 'comfort woman' returns from China an old woman. At the end of the war she can't return home and spends the next 65 years living as an alien in a foreign country. Even to her own granddaughter she seems to be losing her mind. She only wants to go back to Korea.

With high competitive spirit, a high school gangster Seung-in lets nobody to win over him. Hyun-tae is his best friend but wants to fight with nobody. One day, two boys get caught into a big fight that the local mobster is involved in, and they realize what true friends are.