A murder takes place on an evening in the pouring rain, and Cho Jung Hyun, who has just returned to her hometown after 12 years, realizes that Cho Jae Young, her beloved niece, has gone missing. Meanwhile, Choi Hyung In, the detective in charge of the murder case, finds out that there is a relationship between the missing girl and Cho Kyung Ho, the culprit who’s been charged and imprisoned for committing the Saju Station Gas Terror Attack.