After finding Eun-soo's name on a burner phone, detectives Tae-gu and Kyung-do search her home but come up empty. Eun-soo masterfully plays the part of a devoted mother, but Tae-gu's instincts scream that something is dangerously wrong. Some secrets refuse to stay buried.

Forced to pay a blackmailer an impossible sum, Eun-soo and Kyung must restart their dangerous business to meet the one week deadline. As they scramble for the money, they desperately hunt for the culprit who seems to be watching their every move. The truth is closer than they think.