Toxic

Jung Tae-Hun (Kim Sang-Kyung) is the chief doctor of a trauma center in a hospital. His son suddenly collapses with a lung disease. Soon, his wife Han Gil-Ju (Seo Young-Hee) suddenly dies because of the same lung disease. Jung Tae-Hun tries to find a common link between their illnesses. Jung Tae-Hun learns that for several years, many people have visited hospitals and complained of similar symptoms as his wife and son. He finally finds a common link between all of these people.