Woo-jin lost his daughter three years ago in an uncertain accident. He, barely keeping his daily life in deep sorrow, got stumbled by his wife's untimely death. Woo-jin, who has nobody besides him, holds his wife's funeral and falls in despair. But then a single note brought him back; The note says: "The real culprit is still out there." Woo-jin, who had collapsed from the brink of life, rises again. To clear the mystery of the death of his daughter and his wife...