Ahn Byeong-ju's Pon (Phone) is a psychological horror film. Ha Ji-weon portrays Ji-weon, an investigative reporter who is receiving unsettling calls on her cellular phone. Ji-weon's decision to stay with friends for a while leads to the friends' child Yeong-ju (Eun Seo-woo) being traumatized after the girl accidentally answers Ji-weon's phone. Eventually, it is discovered that the preceding owners of that cell phone's number have died. A missing teenager, a secret from the past, and some very disturbing behavior from Yeong-ju all play a part in the final unraveling of the plot.