Kim Nak-su is a middle-aged man who loses everything he once considered valuable in an instant. After a long journey, he finally discovers his true self, beyond his role as a department manager at a large corporation.

A college student gives a young woman he just met a ride to the beach in his father's cab and they end up spending the night together. When he wakes up to find her dead, he gets caught up in her murder case.

A fiercely competitive police officer and an idealistic prosecutor, former high school classmates, reunite while investigating a nationwide serial murder case, pulling them into both a dangerous pursuit and an unresolved personal past.