Sung-soo has everything a man could want: a beautiful wife and children, a comfortable home and luxury car, and plenty of money in the bank. When he learns that his estranged brother, Sung-chul, has gone missing, haunting memories of their troubled past urge him to visit his brother’s apartment in search of answers.
Unsettled by the shabby, half-empty apartment complex, he quickly notices strange symbols inscribed under the doorbells and the terrified residents who hurriedly lock their doors at the sight of an outsider. When Sung-soo asks the next door neighbor Joo-hee about his brother, she reacts with horror, belying her initial kindness to the family in their expensive clothes and car.
