Hyuk Jang

Former physical athlete and father-to-be Joon-Ki works as a PE teacher at an all-girls high school, where many of the students find him to be an attractive man. Young-Eun is a particular outgoing and brash young girl whom is very straight forward and is creative in finding ways to interact with Joon-Ki, whom is the center of her crush. During one fateful rainy day, Joon-Ki is alone in the classroom with Young-Eun and things go too far. Joon-Ki tries very hard to correct the errors of his ways and wants to put it behind him, but the smitten Young-Eun's obsession with him seems to know no limit. And soon Joon-Ki finds himself with a shattered marriage.

The worst epidemic ever seen is sweeping through Bundang, the suburb of Seoul. After smuggling illegal immigrants into the country, Byung-woo dies from an unknown virus. Soon after that, the same symptoms are plaguing scores of residents in Bundang. People are helpless against the airborne disease and the number of infected increases quickly, spreading chaos. As the worst-case scenario precaution, the city of half a million people, just 19 kilometers from Seoul, is about to be sealed off. The government orders a complete shutdown. Meanwhile, infectious disease specialist In-hye and rescue worker Ji-goo go into the closed city to find the blood serum of the index case, a crucial part of developing the vaccine.