In 1933, when Korea was under Japanese occupation, five people in Gyeongseong are suspected to be “Phantom” spies of the anti-Japanese organization.

After a traumatic event, a drug trafficker turns sides and conspires with a dangerously ambitious undercover police officer to bring down the mysterious kingpin of a major drug cartel.

A sickly girl Ju-ran transfers to a new sanitorium boarding school to regain health. But she discovers that students are disappearing and notices abnormal changes happening to her body. She…