Buzz Salon which is run by Cho is known for its mysterious ambience. Gi-hyuk, one of Cho's best customers, falls for Hae-joo, a hostess at Buzz. Cho uses Hae-joo to kill gangsters who harass him with money he owes them. When Gi-hyuk discovers that Hae-joo is biologically male, he feels betrayed and becomes disillusioned. He leaves her for good. Hae-joo is able to get her transgender operation in return for the assassinations and goes in search of Gi-hyuk. She returns to Gi-hyuk, as a new person, calling herself Yoo-jung. She also begins to take revenge on the thugs who abused her in the past.
Aimlessly whiling away their days in the concrete environs of their dead-end suburbia, Vinz, Hubert, and Said -- a Jew, African, and an Arab -- give human faces to France's immigrant populations, their bristling resentment at their social marginalization slowly simmering until it reaches a climactic boiling point.
Along with his new friends, a teenager who was arrested by the US Secret Service and banned from using a computer for writing a computer virus discovers a plot by a nefarious hacker, but they must use their computer skills to find the evidence while being pursued by the Secret Service and the evil computer genius behind the virus.