On the run from a dogged internal affairs agent, a corrupt cop reluctantly teams up with a defiant teen to unravel a conspiracy before it's too late.

Mi-so, a 12 years old girl who transferred from Seoul to Jeju island, meets Ha-eun. They promise never to seperate. At the age of 18, Ha-eun's boyfriend, Jin-woo breaks two girls's friendship. ...

When unidentified parasites violently take over human hosts and gain power, humanity must rise to combat the growing threat.