Sung-soo has everything: 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 has gone missing, he visits his apartment in search of a... more »nswers. 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. The disturbing visit follows Sung-soo and his family home, as they soon find themselves stalked by a mysterious masked figure, and the same strange symbols appear under their doorbell. With his own nightmares escalating out of control, Sung-soo must face his most primal fears to reveal the shocking truth behind the intensifying horror.« less