Ji-yeon Choi

A North Korean refugee named Yoon-hee works hard to bring her daughter who is left alone in China but one day crashes with a handicapped person with her milk delivery bike. The disabled refuses to go to the hospital but sues her as a hit-and-run and this gets spread all over the Internet. She is criticized by netizens and gets fired from all of her jobs. It turns out that the man who sued her is a self-injuring blackmailer disguised as a disabled person. Yoon-hee learns that she's going to need alot of money to win the case and to bring her daughter. She tries to make money through surrogacy but she ends up not getting paid. Being accused falsely, Yoon-hee doesn't trust the lawyer she has who only thinks about the cost and decides to stand up for herself

Soon after Ji-won gets a new cell phone, her friend's young daughter, Yeong-ju, puts it to her ear and immediately begins screaming in terror. When other strange things start happening in connection with the phone, Ji-Won does some investigating and discovers that of the people before her who had the same number, almost all of them died suddenly under unusual circumstances. As Yeong-ju's behavior becomes increasingly alarming, Ji-won digs deeper into the circumstances surrounding the disappearance of the number's first owner, a high school girl named Jin-hie.