Due to a continued rise in greenhouse gas emissions, the global temperatures had once again reached a peak, because of which millions of fish had died due to a bacteria released from melting polar ice. The fish out of ocean water was no longer safe for consumption. Food shortages hit countries around the world and the crisis is expected to last for decades. Due to the decade long isolation, Thailand was relatively unaffected from the crisis and had abundant food resources for its population. Mr. Vasu was a real big shot. He owned a multi-billion-dollar food company called VS Corporation that helped the people of Thailand to survive a major food shortage during the ongoing environmental crisis. Singh, who worked as a driver, was transporting crates filled with fish for the VS Corporation. Some workers carried these boxes out of a shipwrecked vessel. Either this ship was carrying fish caught from the poisoned water, or Mr. Vasu had created a secret lab inside this vessel where his scientist bred these fish in an artificial environment. Purich (Oak Keerati Sivakua) is Vasu's right-hand man. He serves the fish delivered by Singh to group of men sitting around a table, saying that the particular batch of fish is safe. As Purich consumes the fish himself, as men at the table start converting into zombies. Rin is Singh's girlfriend and works as a nurse at the Prachamit Hospital. Rin was quite worried about her boyfriend, Singh, as she believed that he had got mixed up with some really shady people, and someday he might just not return home. Back in the day, when things were normal, Singh used to be a famous Muay Thai fighter, but as the environmental crisis and food shortage hit the country, the citizens totally abandoned these recreational activities in order to focus on their survival. Those without a job had turned to scavenging or become petty thieves who started looting food transport to survive. Due to the rising civil unrest, Bangkok was in total chaos, and martial law was imposed in the city. This was why Rin and Singh had decided to leave the city and return to their village in Chiang Dao. Singh also wanted to propose to Rin. Purich is brought to the hospital, and he converts into a Zombie inside the hospital. As Purich converts, he starts attacking everybody else at the hospital and they start converting into Zombies. Rin finds that Vasu is also at the hospital, along with his wife, who is dealing with a liver failure. Vasu had arranged a "fish liver" for his wife's liver transplant. The liver was from the same fish that Singh transported in. As the Zombie infection starts spreading at the hospital, the army is called in. Singh watches the commotion from outside. Singh enters the hospital to save Rin as the army was not allowing anyone to escape. Singh starts looking for Rin as the Zombies quickly overrun the hospital. After the zombie outbreak in Prachamit Hospital, the Royal Thai Army, or RTA, had planted explosives in the underground parking lot to demolish the building and prevent the chances of mass contamination. But shortly after placing the charges, the army chief received an order to evacuate Mr. Vasu (Johnny Anfone) and his wife, Ann (Duangporn Oapirat), from the building. Rin, meanwhile, reaches a security control room and can see through the video feeds that the hospital is overrun by Zombies. Singh finds Buddy, a boy that had befriended Rin, and he says that Rin is on the 5th floor. Buddy finds his own mother on the 5th floor, who was still human. She tells Singh that Rin was taken to the 10th floor at meet Vasu. She sends Buddy with Singh as she knew that the hospital was not safe and she stays behind as she was bitten and was already converting. Singh and Buddy reunite with Rin on the 10th floor. As Singh and his boss drove towards the city, one could spot a billboard that said "Insect Farming Project For Food Security," which could suggest that VS Corporation had been running a number of similar experiments to increase food production, and they might have ended up mixing up the wrong DNA, therefore giving birth to a contagious virus. It's possible that Mr. Vasu might have accidentally created a hazardous virus in order to curb food shortage. And ironically, in the end, he ended up becoming prey to his own Frankenstein's monster. The army unit reaches Vasu, who says that he wants a doctor with him. The army unit finds Rin and shoots Singh, not knowing whether he is converted. They force Rin to come with them, taking care of Vasu's wife as she is shifted. The army unit is overrun by Zombies and Singh is rescued by Rin and nursed back to health. Meanwhile Singh (Mark Prin Suparat) decided to face the horde of zombies with his punches and kicks so his girlfriend, Rin (Nuttanicha Dungwattanawanich), and their young companion, Buddy (Vayla Wanvayla Boonnithipaisit), could reach the terrace and escape the building. Before leaving the hospital, Singh proposed to Rin and gave her the ring, as he wanted to spend the rest of his life with her in their hometown. But unfortunately, they couldn't escape the horde of zombies, and Singh had to stay back so the love of his life could survive. Singh had burned down an army officer converted into a zombie, which activated the fire sprinklers in the hospital, and the moment all these bloodthirsty zombies came in contact with water, they suddenly transformed into beastly creatures with teeth as sharp as piranhas and their bodies covered in scales. They turned into zombie fish. Singh sends Rin and Buddy ahead as he engaged with the Zombies in the parking lot. During his clash with the zombies in the parking lot, Singh noticed that someone had planted bombs in the building, which were about to explode in 3 minutes, and because there was no other way to leave the building in such a short time, Singh ran towards the terrace. An army helicopter was waiting there for Mr. Vasu and the team that had gone to extract him, but because they were long dead, the armed personnel decided to take off with Rin and Buddy. However, Rin didn't want to leave without Singh and begged the army men to wait for him, but as usual, they didn't listen, as they knew that the bombs could go off any moment, killing everyone in the vicinity. Hence, the helicopter flew away as Rin and Buddy saw Singh fighting the zombies on the terrace during the sunset. Suddenly the bombs exploded, taking down the entire building. And even though it looked like Singh wouldn't survive the blast, surprisingly he did. Mr. Vasu and his wife got infected, turned into zombies, and probably died in the explosion. Singh was looking for a means to survive the blast, and it's likely that during his last fight with the zombies, Singh jumped into one of the water tanks on the terrace. The water and the tank not only protected Singh from the flames but also minimized the damage as the building collapsed to the ground. Later a zombie, probably hunting for human flesh, opened the tank lid, and Singh jumped out of the tank and kicked the zombie and crushed its head on the ground.
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