The Demilitarized Zone (DMZ) is a most dangerous zone in the world, which was established on July 27, 1953 when the Armistice Agreement was signed during the Korean War. And now in the DMZ... the struggle for survival of the female police who started to step on the landmine while chasing the jailbreaker. She only has Bluetooth, a revolver, and courage!

Art student Jeong-hwa (Seo Woo) is moving to a smaller apartment by her school when she trips and falls, breaking a small statue on a box. She bends over to pick up the pieces and notices an amulet the shape of a queer mask and decides to use it for her exhibit assignment. After she moves she hears a weird knocking sound next door. She can’t sleep because of the knocking sound every midnight and starts sketching the amulet. One night, Jeong-hwa comes home late and runs into a strange woman with long tangly hair and barefoot in front of the elevator. She gets off without a word and starts knocking next door. Jeong-hwa is terrified, what is going to happen to her?

追踪谜样的出租车的取材组全员下落不明！不久后，出现了当时取材的纪录影像……到底当晚发生了什么事呢？！某天，一位失踪女记者的妹妹表示自己握有犯人犯案的证据……存储卡视频中的犯人还戴着河回面具……究竟视频中所透露的真相为何？！