A kidnapper disappeared 15 years ago without a trace. Five days before the case's statute of limitations expires, someone anonymously leaves a flower at the crime scene. A few days later, another kidnapping takes place using the same method on a similar target. Three people team up to solve the case before it's too late: the grandfather (Song Young-chang), who lost his granddaughter right in front of him, the mother (Uhm Jung-hwa), who has been searching for the person who abducted her daughter 15 years ago, and the detective with a guilty conscience (Kim Sang-kyung), who puts everything into this long-unsolved case.