The Flu (감기; RR: Gamgi) is a 2013 South Korean disaster film written and directed by Kim Sung-su about an outbreak of a deadly disease with a fatality rate of 100 percent, which throws a city into chaos. It stars Jang Hyuk and Soo Ae.
A group of illegal immigrants are smuggled to South Korea inside a shipping container, but when it's opened in Bundang, an affluent suburb of Seoul, it's discovered that all of the immigrants are dead, except for one man, a carrier of a deadly strain of H5N1 (avian influenza, or bird flu). As the man escapes, he quickly spreads the virus to nearby residents. With an outbreak rate of 2,000 new cases each hour, with death occurring within 36 hours of infection, the epidemic plunges the city into total chaos.
Without a cure and out of fear that the disease will spread to the rest of the country, and possibly the world, the governmentquarantines the infected in Bundang. As the people desperately struggle to survive within those walls, doctor and single mother Kim In-hae (Soo Ae) scrambles to find a vaccine for the virus. When her only daughter Mi-reu (Park Min-ha) is infected, she is helped by rescue worker Kang Ji-goo (Jang Hyuk), who saves her from a car accident, enabling them to join together and race against time to find a cure and keep the girl alive.
Byung-Ki (Lee Hee-Joon) and Byoung-Woo (Lee Sang-Yeob) drive to the shipping container to release the immigrants. They soon discover that all of the immigrants are dead, except for one man.
Soon, thousands of people become infected every hour by the deadly virus, which kills within 36 hours of infection. The entire suburb of Bundang is quarantined by the government in a desperate attempt to stop the virus from spreading further. Firefighter Kang Ji-Koo (Jang Hyuk) is one of those quarantined. Dr. Kim In-Hae (Soo-Ae) is one of the first responders to the outbreak of the virus. The outbreak becomes even more personal once she suspects her own daughter (Park Min-Ha) is infected by the virus. Firefighter Kang Ji-Koo and Dr. Kim In-Hae frantically work together in a race against time to find a cure.