Kwon Se-jeong (Jun Ji-hyun), a leading biotechnology professor, is invited to attend an international science conference in a building. The event turns chaotic when a virus created through the experiments of Seo Yeong Cheol (Koo Kyo-hwan) mutates rapidly, enabling zombies to adapt, communicate, and evolve independently. Amid the crisis, Se-jeong works together with building security officer Choi Hyun-seok (Ji Chang-wook), who is determined to protect his younger sister, Choi Hyun-hee (Kim Shin-rok), who has special needs. Outside the building, researcher Gong Seol-hee (Shin Hyeon-bin) attempts to develop a vaccine to stop the outbreak.

Director Yeon Sang-ho is previously known for films such as Train to Busan (2016) and Peninsula (2020). Colony presents a life-and-death struggle within a confined space while depicting the emergence of a new species that blurs the boundary between humans and other creatures. Production began in mid-2025, with filming taking place in Seoul and Incheon. Featuring urban settings devastated by a deadly outbreak, the film is reported to have a production budget of approximately US$20 million. One of South Korea’s large-scale thriller productions of 2026, Colony has been classified by the Indonesian Film Censorship Board (LSF) for audiences aged 13 and above. (air)