Woody Invincible and Crazy Bee are two young men trying to get by in a bustling shopping mall by selling bootlegged VCDs, indulging in gambling, and stealing from other shops in their quest for quick money. Their day-to-day lives take a chaotic turn when they cross paths with Rolls, an employee working at a nearby beauty parlor. Their fleeting encounter sets off a chain of events involving dangerous characters and alarming incidents.
The movie introduces a subplot involving black market dealers who supply a bioweapon to three government agents. This bioweapon, which turns humans into zombies, is demonstrated by a zombie during a showcase, but the creature unexpectedly breaks free, killing two agents in the process. Meanwhile, Woody and Mr. Kui, the cellphone shop owner, are involved in chaotic activities, including Woody hitting a surviving agent who is carrying a sample of the toxic weapon in a soft drink bottle. Curious and mistaken for a refreshment, Woody ends up drinking the sample, unwittingly exposing himself to the deadly substance.
This contamination sparks chaos within the mall as the zombie virus begins to spread. Woody and Crazy Bee decide to sell a recovered cellphone to Mr. Kui but are still unable to fix their battered car. In their desperation, they resort to stealing Rolls's money and ring. A suspicious Rolls then tricks Woody into finding the robbers, planning to get him drunk and make him admit to the theft. Following this, Woody, Rolls, and Loi—a sushi bar waiter who has also caught the zombie virus—become entangled in a rapidly escalating nightmare.
Loi, who initially flirts with Rolls, suddenly becomes a zombie and captures her, creating a tense and heartbreaking turn in the story. The zombie outbreak intensifies as the infected start attacking other mall-goers, leading to violent confrontations with the authorities. The police, including Policeman #3001 and Policeman #9466, arrive to contain the chaos, but their efforts are thwarted as the infection spreads further, and many officers, including #9466, are forced to fight for their lives.
Amidst the chaos, the mall's security measures trap everyone inside, with the reanimated dead forcing the remaining survivors into hiding. Woody takes the lead in rescuing Rolls from Loi, who continues to struggle with his own zombie urges. They regroup in a beauty parlor, where tense decisions are made. The group’s attempts to escape via an elevator are thwarted when the elevator is disabled by the zombies. Tragedy strikes as the Kui family—both Mrs. Kui and Mr. Kui—are killed, deeply impacting the remaining survivors. During this chaos, Ox, the mall security guard, also becomes a zombie and attacks, leading to further losses.
In the climax, Woody and Rolls fight their way through the parking garage, now teeming with zombies, in a desperate effort to escape. With the help of Loi, who pushes open the garage shutter and assists in pushing the car out, they finally reach safety. The scene shifts to a gas station where Woody tries unsuccessfully to find a working phone to seek help, but the chaotic situation persists.
A chilling warning is broadcasted: soft drinks might contain the biochemical substance that caused the outbreak. As Woody observes Rolls drinking from a bottle he earlier took from the agent, he realizes the danger. The story concludes with Woody and Rolls in the car, and with a tense, unsettling mood, Woody drinks from the same bottle, suggesting the threat is not yet over.
This film explores themes of chaos, survival, and mistrust amidst a viral outbreak, blending moments of horror, action, and emotional tension as characters face near-extinction.
