After committing a series of multiple murders, a neurologist visits an incarcerated killer, living in exile. She studies him and his brain and discovers the horror that lurks behind his violent impulses.
7 years ago, an aspiring actress Suyeon came to Seoul after losing touch with her family, and is barely surviving by playing minor roles and chores in a small troupe. Then one day, Suyeon receives a call from Tongyeong and goes down there.