Deok-Hee (Ra Mi-Ran) is an ordinary citizen. She becomes a victim of a voice phishing scam. She loses tens of thousands of dollars in one moment. With the help of Jae-Min (Gong Myung), Bong-Rim (Yum Hye-Ran) and Sook-Ja (Jang Yoon-Ju), Deok-Hee chases after the voice phishing group. Jae-Min is a member of the voice phishing group and Deok-Hee's secret informant. Bong-Rim is Deok-Hee's friend and co-worker. Sook-Ja shares Deok-Hee's enthusiasm to catch the voice phishing group.