Colony (2026)

Scientist Seo Yeong-cheol releases a mutated slime-mould bioweapon at a biotech conference in the Dongwoo-ri Building. He has injected himself with the only vaccine. The first infected, Kang Woo-chul, starts biting people, and the building is sealed off. Biology professor Kwon Se-jeong, her ex-husband Han Gyu-seong, security guard Choi Hyun-seok, his sister Choi Hyun-hee, researcher Gong Seol-hee and others are trapped inside.

The infected are connected by white, fungus-like threads and chemical signals, so they share their senses like a hive. At first they move on all fours and react only to light and movement, even attacking pictures of people. But every time the survivors escape, the hive learns. The infected begin to stand up, copy human behaviour and later use guns. Sprinklers spread the spores further through the building.

Yeong-cheol, who is immune, deliberately gets bitten so that he can link to the colony. He then controls it like a single body and sees through the eyes of every infected, letting him hunt the survivors. Gong Seol-hee's earlier experiments with monkeys suggest that each colony has one leading host, and if it dies, the others go dormant.

One by one, the survivors fall. Han Gyu-seong is killed in a clothing store. Choi Hyun-hee sacrifices herself to save her brother, but, under Yeong-cheol's control, she returns infected and kills him. Yeong-cheol leads the horde out of the tower and into the city.

Se-jeong remembers how ants that lose their trail can march in a circle until they die. She covers one infected in a coat soaked with the hive's own threads, and the horde follows it in an endless loop that overloads the hive. Yeong-cheol is knocked into a burning car and dies, and the colony freezes. Se-jeong and Seol-hee agree to work together on a cure. As the camera passes the frozen horde, one of the infected slowly moves again.

How does the infection work? It is a mutated slime mould. Each bite creates a new infected, and they are all linked by white threads and chemical signals, sharing what they sense. The hive learns from every failure, so the survivors can never use the same trick twice.

What is the ant mill trick? When ants lose their trail, they can follow each other in a circle until they die. Se-jeong recreates this by covering one infected in a coat soaked in the hive's threads. The horde follows it in a loop, which overloads their shared network.

Why do the infected freeze? Each colony has one leading host. Yeong-cheol had linked himself to the hive and made himself its leader. When he dies in the burning car, the colony goes dormant.

What does the final shot mean? One frozen infected starts to move. Seol-hee's research showed that a dormant colony reboots to its original behaviour when it wakes. The outbreak is not over, which sets up a possible sequel.

Why did Yeong-cheol do it? His father took his own life after a scandal, blaming "imperfect communication". Yeong-cheol came to believe that separate minds cause all conflict and wanted to link humanity into one shared mind.

Is Colony connected to Train to Busan? No. It is a new story with a different kind of infection, separate from Seoul Station, Train to Busan and Peninsula.