Residents of a small apartment building learn that a serial killer lives within their building. A stepmother (Kim Yun Jin) feels heavy guilt for not being able to prevent her stepdaughter's murder. The stepmother takes it upon herself to find the killer. Meanwhile, a young girl (Kim Sae Ron) that resembles the murdered girl becomes the next target of the serial killer.

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  Kim Sae Ron (Yeo Seon / Soo Yeon)

  Main Role

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  Kim Yoon Jin (Kyeong Hee)

  Main Role

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  Kwak Min Suk (Ahn Dong Joo (pizza store owner))

  Supporting Role

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  Kim Sung Kyun (Seung Hyeok)

  Supporting Role

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  Jung In Ki (Kim Hong Jung (Ahn Hyuk Mo's uncle))

  Supporting Role

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  Do Ji Han (Ahn Sang Yoon)

  Supporting Role

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