Sung Soo is a successful businessman who lives with his wife Min Ji and their 2 children in a luxury apartment. Life is mostly good, except for an older brother from whom he's estranged.One day, Sung Soo receives a phone call that his brother is missing and goes to his brother's apartment building for the first time in decades to look for him. There, he finds strange symbols carved into every door and meets Joo Hee and her young daughter. Joo Hee is convinced that someone is spying on them and lives in constant fear. Sung Soo figures out that the symbols carved onto the doors are "hide and seek codes" that indicate gender and number of people. Then when he returns home, he finds similar symbols carved into his door.
- Other name: 숨바꼭질,Sumbakkogjil
- Genre: Horror, Murder, Suspense, Thriller
- Status: Completed
- Duration: N/A min
- Country: South Korea
- Network: N/A
Cast: Byeon Woo Jong, Eom Ji Seong, Jeon Mi Seon, Jeong Joon Won, Jeong Min Seong, Jo Han Cheol, Jo Shi Nae, Ki Joo Bong, Kim Bo Ryeong, Kim Hak Ryong, Kim Han Jong, Kim Jeong Woo, Kim Ji Yeong, Kim Soo Ahn, Lee Dal, Lee Do Yeon, Lee Gyoo Seop, Lee Joon Hyeok, Lee Yeong Mi, Lee Yeong Seok, Moon Jeong Hee, Noh Susanna, Park Geon Ah, Park Geon Gyu, Ri Min, Seong Yoo Bin, Son Kang Gook, Son Yeong Soon