Do Yong-gu

As Inchon citizens run for cover in the pouring rain, a mysterious man walks up Forty Steps and stabs another man to death. He disappears with a briefcase full of cash while his accomplices finish off the dead man's subordinate. The initial police investigation reveals an underground drug world at war. A detective addicted to his job and works by instinct leads the investigation.

Torn between his pregnant wife and his jazz-singing mistress, a detective loses his grip when he becomes embroiled in a murder investigation.