ARC 5

아크 5: 사칭 지령

Five cases, strung on one thread in publish order. The thread's color is the paywall.

5 cases are connected in release order. No cases are owned yet.

Discharge Sequence

Seolun Metropolitan City Wastewater Treatment Plant, Sludge Digestion & Dewatering Building. Deep winter, dead of night. Seo Gi-beom, an external contract inspector, was found dead in the underground pit—a narrow work trench dug below floor level in the dewatering building. Cause of death: acute hydrogen sulfide poisoning, the rotten-egg gas. At that hour the surplus gas discharge system stood open. The digester—a large sealed tank where sludge is broken down by microbes—was running. Inside it, the agitator churned the slurry. Interrogate the five people who were on-site that night and find the hand that moved that system.

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The Door He Kept

In the dead of a winter night, on the high ground outside Seolun Metropolitan City, contract inspector Han Mu-yeol was found dead in the outdoor valve chamber of a reservoir that collects water and sends it down to the district below. The unheated valve chamber door had been locked from the outside, and the cause of death was hypothermia. Five people were connected to this reservoir and its night operations that night. No official record gives a reason to keep that door locked for six hours. Interrogate the five and find the hand that kept that door shut.

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Fasting

In the dead of a winter night, at the Seolun Metropolitan City pressure regulation station—where city gas pressure is reduced and regulated for safe distribution—external verification inspector Kim Jae-gwang (55) was found unconscious in the metering room and died at dawn. Cause of death: hypoglycemic coma. A Type 1 diabetic, he had been confined from around midnight for over five hours in the verification zone, legally mandated for meter inspection and sealing, and during that time consumed nothing but water. Interrogate the five people who remained at the station that night and find the culprit.

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Cross Flush

Seolun International Airport, de-icing fluid supply base support building waiting room. Kang Seok-woo, an external contract inspector working through the night on verification, died at dawn. Cause of death: acute ethylene glycol poisoning—the toxic substance also found in antifreeze. Metabolic acidosis accompanied the poisoning, his blood turning acidic until his organs failed. The water he drank from the hot-water dispenser had been contaminated with aircraft de-icing fluid. It was a night under freezing forecast; the entire base system was running, personnel scattered to their assigned posts, and the support building where the victim stayed was out of sight from the control room. Interrogate the five people entangled in that night's systems and orders. Find the killer.

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Face to Face

On the outskirts of Seolun Metropolitan City stands the office building of Yeonshin, a contracted operator handling after-hours emergency communications for key public facilities. In the dead of a midwinter night, in the basement cable and materials room, external auditor Kim Byeong-un was found with a stab wound to the chest. Cause of death: acute hemorrhagic shock from excessive blood loss in a short time. He was the only external channel authorized to audit this company, a man famous for refusing any instructions by phone and accepting all correspondence in writing only. That night's late session was his final audit interview. Interrogate the five people who entered and exited the building that night and find the killer.

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