A mystery thriller that pursues the truth of a missing sister in an apartment that is scheduled to be reconstructed. Suspicious neighbors who hide their greed behind ordinary appearances and the secrets that are revealed the more they dig are expected to provide intense suspense in conjunction with the extreme fear of reality.
Ji Na, who left her family and is living as a hotelier in Busan, receives a phone call from her father saying that her sister has not been contacted for several days. Using her vacation, she goes up to Seoul to find her older sister Ji Hyeon, who is not in regular contact with her. When she arrives on the balcony of her apartment, she finds a shocking figure. (Source: Namu Wiki)
Ji Na and her father, Hyung Sik, find a mannequin hanging by the neck and bloodstains on the balcony of their house. Thinking it has something to do with Ji Hyeon's disappearance, they report it to the police and meet detective Min Soo for help. Back home, Sook Ja, head of the Women's Council at their apartment complex, tells Ji Na about a quarrel between her older sister Ji Hyeon and ex-convict Woo Hyuk, causing Ji Na to suspect Woo Hyuk. (Source: Namu Wiki, MyDramaList)
Ji Na breaks into Woo Hyuk's camper illegally, finds evidence related to her sister, and tells Min Soo that he is the culprit who kidnapped her. On the way to Woo Hyuk's camper with Ji Na, Min Soo chases and arrests Woo Hyuk who is running away. Woo Hyuk has a seizure during interrogation and is taken to the hospital but is released because the evidence was obtained illegally. Hyung Sik watches Woo Hyuk being released from afar. (Source: Namu Wiki, MyDramaList)
With Min Soo's help, Ji Na and Oh Beom are investigating the apartment CCTV and discover a suspicious video. As she turns to the CCTV of Charlie's suspicious behavior in the management office, she encounters friction with the apartment residents who act irrationally. Meanwhile, Hyung Sik is following Woo Hyuk and is shocked to see Woo Hyuk's bizarre behavior. Convinced Woo Hyuk is the culprit who kidnapped Ji Hyeon, Hyung Sik eventually kidnaps him. (Source: Namu Wiki, MyDramaList)