A Hard Day — Characters & Cast

To protect his career, keep his freedom, and safeguard his young daughter and sister from murderous blackmail.

Begins as an opportunistic, stressed-out cop willing to skirt the law; pushed to extreme physical and psychological limits, he survives Park's terror and walks away hardened, wealthy, yet spiritually ambiguous.

To retrieve the vault key held on the corpse of his embezzling partner, protecting his multi-million illicit drug fortune.

Enters halfway through the film as a mysterious tormentor, escalating into an almost unkillable physical force before meeting a violent demise at the bottom of an apartment pond.

To uncover the truth of the hit-and-run case while shielding his unit and partner from total destruction.

Suspicious of Gun-soo's bizarre behavior, he pieces together the hit-and-run clue trail but chooses camaraderie over immediate betrayal, only to pay the ultimate price.

To sweep departmental misconduct under the rug and preserve precinct hierarchy.

Navigates the internal affairs scandal by urging cohesion and cover-ups, serving as the emblem of low-level structural policing compromise.