During an epidemic outbreak of Joseon, rumors spread about a dreadful man-eating creature that wrecks its plague-infested capital. Upon King’s order, an unsung military official, Yun Kyum, his daughter Myung, an archery prodigy and other warriors head for the capital to fend off the beast.

Hyunjin, a test taker, moves into an old apartment. There are strange sounds from next door where a strange boy named Hyunggu lives. One day, Hyunggu and his mother are cruelly murdered.