Kim In-hae, moments before the car falls to the bottom of the shaft. Out of grief, Chul-gyo takes off his mask and embraces his mother, intentionally infecting himself. Ji-goo puts down Mi-reu at a bench and saves a woman from falling off an escalator, only to have her begin coughing blood. Johnny must live up to the hero status Hamish presents him as. Despite having saved her life, In-hae was ungrateful towards Ji-goo, claiming that he was bragging when it was simply his job to rescue her. Moved by the sight, the soldiers do not fire at her. On the way to deliver the man to their boss, the brothers stopped at a rest stop near Budang, with Byung-woo beginning to show signs of illness.
However, his concerns are overruled by the politicians and official. However, a commotion is heard outside, and the members of the meeting rush to the meeting, just in time to witness carnage unfold below on the streets. In-hae is informed by her colleagues that Monssai has been discovered, and she is hopeful that a vaccine can be made from his anti-bodies. Meanwhile, as Byung-ki is searching for the missing immigrant, Byung-woo's condition deteriorates, becoming feverish, having rashes on his face as well as Byung-ki immediately takes him to the hospital. The President then makes a speech to the citizens of Budang, promising that the government would not fail them, as well as halting all attacks on the civilians and dispatching medical teams to Budang. As Ji-goo is walking around the mall carrying Mi-reu, people begin showing signs of panic, with frantic phone-calls being made and people hurrying to get out of the city.
Mi-reu's rashes are already quite visible, so she is wrapped in a blanket in order to hide the physical symptoms. Bundang's congressman, Choi Dong-chi as well as many other city administrators are unconvinced that the flu could reach epidemic proportions, refusing the head-doctor's idea to shut down and quarantine the city. He has lost his memory. He happens to connect people who are not good with love. He decides to help the orphans by creating a choir, thereby healing their wounds with beautiful songs with the help of volunteer teacher Park Ju-mi.
When Mi-reu sees her mother, she instinctively runs towards her. After Ji-goo attempted to comfort her, she stormed off. The soldiers are instructed to keep their gas-masks on at all times, lest they risk being infected by the virus. It was also promised that individuals not showing any symptoms of the disease would be allowed to leave the camp after 48 hours. He later admits to his co-worker Bae Kyung-ub that he found In-hae attractive. He tries to find any clue as to who he might be, but nothing comes out.
As he's receiving his medication, Byung-woo begins coughing more frequently, infecting several people including the clinic doctor, a small child and a high-school student. Gook-hwan discovers Mi-reu when Ji-goo goes to help the citizens who had been shot by the soldiers. Despite attempts to sterilize the container with incendiary devices, several rats escape into the city. The two split up in order to find Mi-reu, with In-hae suggesting to Ji-goo that he cover his face to prevent becoming infected. As the situation between Byung-ki and the hospital staff became violent, Byung-woo's condition deteriorated dramatically, forcing the hospital staff to call a. The next day, Mi-reu went looking for a stray cat she had been feeding.
The relatively affluent citizens of Budang do not react well to being housed in quarantine camps, complaining about the living conditions. The Budang administration and most of the research staff at the hospital evacuate to Seoul, where the Prime Minister and President are briefed on the situation in Budang. They soon discover that all of the immigrants are dead except for one man. After taking sympathy on him, Mi-reu feeds the immigrant, named Monssai, the food meant for the cat. In-hae reaches the quarantine defense lines, but is unable to make it past the soldiers. In-hae and Mi-reu manage to reach the town-hall in time for the last helicopter to Seoul. Mi-reu responds that her father left her mother and herself and had moved to America many years ago, after Ji-goo leaves to get her a slushee, Mi-reu begins to show signs of light-headedness, one of the first symptoms of the flu.
Chan-Young is a colleague of Lee Hyeong and he likes Hyeong-Gyeong,. Snyder orders the troops at the defensive line to shoot anyone that crosses a line drawn in the highway. Ji-goo is exhausted by what he believes is a wild goose chase, telling Mi-reu to call her father. The Good a Bounty hunter , the Bad a hitman , and the Weird a thief battle the army and the bandits in a race to use a treasure map to uncover the riches of legend. The head-doctor expressed his reservation about keeping the healthy and infected in such close proximity to each other, worrying about the infected spreading the virus to the unaffected. He assigned to another unit and comes across war orphans, some of whom are exploited for profit.
This however, has the effect of isolating the people in the camps from the rest of their country, resulting in unease in the camp populace. When they open the doors, they find the immigrants lying dead and covered with and blackened blood. In-hae checks up on Mi-reu's condition in their tent, realizing that the rashes were getting even worse. ByungKi Lee HeeJoon and ByoungWoo Lee SangYeob drive to the shipping container to release the immigrants. One of his contacts claims to have found the girl. The movie ends with Mi-reu sneezing.
One of the members, Kang Ji-goo rappels into the shaft and manages to rescue the woman, Dr. However, they noted that no avian flu had ever acted this quickly before. This daughter, Mir played by is an object that exists to get in trouble and create crisis. In-hae rushes past the soldiers and stands in front of the defensive line, looking for Mi-reu. Ji-goo goes searching for Mi-reu after stabilizing Kyung-ub, but is unable to find her before she is pushed to the front of the crowd. When Ji-goo reports this to In-hae, she realizes that Mi-reu developed the antibody, and that there is still hope despite Monssai's death. In-hae went through his belongings and located his cell-phone, finding the video he had taken earlier of the immigrants.