A series of black garbage bags filled with dismembered body parts begin to show up around the city: in an elevator, on a highway, at the edge of a basketball court, and rendering the victims nearly impossible to identify. The killer's motive is a complete mystery. Leading the investigation is Detective Cho, a burnt-out cop trying to redeem himself with this case. Setting up a special squad dedicated to these gruesome murders, Cho and his partner, the veteran Detective Oh, map out the order of the murders, interchanging the parts like pieces in a grotesque puzzle. Mystified by the surgical precision of the dismemberments and finding a medical antiseptic called "Hexamedrin" spread all over the bodies, the detectives start suspecting a doctor or a biologist as the killer.

A break opens up when Cho is led to a beautiful and enigmatic young artist, Chae Su Yeon, whom all the victims have had relations with. But besides this revealing breakthrough, Cho is far from solving the case. Still not having found a motive, Cho is grasping for many clues. As the murders continue, Cho is drawn closer to Su Yeon and begins unravelling her tortured past, leading to new questions and suspects. Cho and Oh subsequently discover that her father, a famous painter, mysteriously disappeared years before. Cho decides to investigate her late college classmate and current colleague Ki Yeon, and her friend, Sung Min.

While Cho questions Ki Yeon, the fragile Su Yeon is attacked but manages to escape. After being released from police custody, Ki Yeon disappears, and the next morning Detective Cho is notified of the fourth murder. Under the rainy urban landscape of Korea's capital, another garbage bag is discovered on a highway. This time, the corpse is a head-less Ki Yeon.

Sakurai is an aspiring actor who becomes frustrated with his life. Sakurai then decides to kill himself, but before committing suicide Sakurai heads off to a public bathhouse. At the bathhouse, Sakurai then witnesses a man named Kondo collapse and lose his memory in front of Sakurai. On a sudden whim, Sakurai switches locker keys with Kondo and pretends to be Kondo. Sakurai soon finds himself in trouble with the Yakuza.

Bartender Tyler (Nicholas Tse) dreams of paradise in chaotic and over-speed modern Hong-Kong. The best way for him to fulfil his wish is to make as much money as quickly as possible. One night, he gets pissed with a beautiful young lesbian and undercover cop, called Ah Jo (Cathy Chui). Both don't remember anything the following morning. Ah Jo realises that she might be pregnant. Tyler decides then to take his responsibilities as a young father and he really looks for a job that can provide a quick buck. He gets hired in the protection company owned by former loan shark Uncle Ji (Anthony Wong). Jack, an ex- member of a South American commando team, has finally settled in Taiwan as a mere butcher to live a new life. He got married with Hui (Candy Lo) and got her pregnant. A happy and peaceful future is awaiting the new family until his former team-mates arrive in Hong-Kong. Their mission is to kill Hui's father, a powerful Triad boss. Troubles arise when Uncle Ji and Tyler are hired to protect the Boss and when Jack is forced to kill him…

An old man suffering from depression is found dead, and his housekeeper, Mi Ran, is charged with the murder. Mi Ran's defense attorney, Soon Ho, is surprised to learn the only witness to the crime is Ji Woo, a teenage girl with Asperger’s. Will Ji Woo be able to take the stand and provide a valid statement?

Babu is a delivery boy living with his friends Yesu and Abhi. Due to his meagre salary, he decides to quit, but then Yesu gives him an idea. The idea, however, soon spirals out of control and Babu finds himself...

Zhou Nan (played by Mu Tong), a passionate young man in Bengcheng, is entrusted by market administrator Li Daguang (played by An Zehao) to help him find the lost adopted daughter Li Yan. As the investigation deepened, many clues pointed to the local human trafficking gang headed by Lao Jiu. Li Daguang tried all means to retrieve his daughter, and even sought revenge on Lao Jiu after he turned against Zhou Nan. At the same time, policeman Zhao Jia (played by Huocheng Cheng), who has been investigating the old nine, also found Zhou Nan, and together with him he retrieved the missing Li Yan and uncovered an unknown story about Li Daguang.

Her professional skills of pretense and deceit easily got Young-ju out on parole. On a train to attend her sister's wedding, she runs into Hee-chul, a man in love with a girl he is just about to propose to.

By some bad? or perhaps good? luck Young-ju and Hee-chul run into each other and she mistakes Hee-chul as a bum trying to molest her. Their first chance encounter turns out quite embarrassing. On top of that a pickpocket steals Hee-chul's engagement ring! Young-ju is worried that she might be accused of the theft, so she sets out to bring him back the ring. Amidst the hassle, she is left behind on the platform. The train has left, carrying away her own luggage. And all that she has with her is the ring. What she needs is her luggage back. What she doesn't need is to be accused of theft. Young-ju finds her way to Hee-chul's home and the family seeing the ring thinks she is Hee-chul's fiancee! To wiggle herself out of the situation without adding another crime onto her record, she uses the skills of her profession and cons everyone into believing indeed she is the one.

Meanwhile, our poor Hee-chul returns home without proposing to his girl for lack of the ring, and finds that his family, in fact the whole town now blame him for deserting an innocent woman. Surprise! Surprise!

Now the bout is on between deceit and truth. Conwoman-turned-fiancee of the town's pharmacist vs. the pharmacist framed for rejecting a faithful woman.

Tanaka is going through a tough time trying to support his younger sister Mitsuko, recently arrested and hold up in jail. As an investigative reporter, he immerses himself into a story about a shocking murder case gone cold. The “perfect” family—successful businessman, beautiful wife and adorable child—was brutally murdered a year ago and the case remains unsolved. Tanaka interviews their friends and acquaintances, and as stories of their true nature unfold, he begins to discover that the family was not as ideal as believed. The interviewees themselves unveil their own hidden natures, revealing a disturbing portrait of social elitism.