Văn Phòng Bí Ẩn, Office (2015)

Kim Byeong-Gook, the owner of a company, lived a seemingly normal life with his family and was confident in his work. However, one day, he brutally murdered his entire family and vanished without a trace. Detective Jong-Hoon, assigned to investigate the murders, questioned Kim Byung-Gook's colleagues at the office. They were unsure about the details surrounding the incident. Meanwhile, Lee Mi-Rye, who was close to Kim Byeong-Gook, seemed to be hiding something. Detective Jong-Hoon decided to review the office's surveillance footage and observe Kim Byeong-Gook upon his return to work after the killings. However, they were unable to determine his whereabouts when he left the office.

Back at the office, Kim Byeong-Gook's colleagues were filled with shock and anxiety, concerned about his whereabouts and living situation.