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In 1997, a mysterious ghost (Lee Si-Young) saved humankind and then disappeared. The mysterious ghost appears again 24 years later and helps a serial killer's (Kim Sung-Kyun) escape. Kim Sae-Ha (Seo Kang-Joon), Jung Sae-Byeok (Kim A-Joong) and Song Eo-Jin (Kim Moo-Yul) pursue the ghost for different reasons.