Open Case File · S1-ARC3-COLD
Locked Cold
Yang Hyeon-sik, secretary of the frozen logistics labor union preparatory committee, was found dead from oxygen deprivation in a low-oxygen refrigeration chamber—a sealed facility compartment designed to trap cold air—at an automated frozen logistics sub-terminal. Late that night, he had entered the chamber to verify that the emergency release mechanism opened and closed properly, and the terminal was operating normally even immediately after the incident. There were no malfunctions in the cooling and nitrogen systems, and the chamber had been sealed according to shift-end procedures—except the emergency release mechanism, which was supposed to open from inside, did not open. Interrogate the five people involved in this death and determine whose hand locked that chamber.
Scene
low-oxygen refrigeration chamber zone of an operating automated frozen logistics sub-terminal · midsummer rainy season late night
5 suspects
Kang Cheol-gyulogistics subcontract management director50s. Attaches numbers and unit prices to every sentence, calculates losses first. When pressed, pulls out contracts and meeting minutes first to defend his position, detests emotional talk.
Lim Hyeon-dolate-night picking/sorting worker (app-assigned labor)40s. Few words, reluctantly answers only what's asked. Noticeably gaunt over recent months, and suppressed resentment bleeds into his voice when shifts or hours are mentioned. Yet he never skips the closing procedures he's assigned, following them in order.
Jeong Yu-chanentry/exit and personnel verification officer (late-night control assistant)30s. Quietly inconspicuous, never mistakes numbers. Doesn't volunteer troublesome topics, but when asked about records he's assigned, points out only facts precisely.
Oh Gyeong-wancenter grievance and safety report officerMid-40s. Always polite with smooth responses. However, before questions involving responsibility, retreats half a step behind the phrase 'received and escalated upward.' Detests emotional talk.
Bae Do-hunrefrigeration equipment technician40s. Usually speaks in clipped phrases, but suddenly becomes detailed when refrigerant or piping comes up. Suppressed resentment bleeds into his tone when personnel cuts and increasing late-night calls are mentioned. When asked about responsibility, first clarifies 'that's not my system.'
Exhibits
Control Operations Log and Settlement Records
Shift and operating hour assignments and settlement records extracted from the late-night logistics app's control console—an operation panel with screens for controlling machinery. Assignment details and settlements are completely filled in, with no apparent operational defects on the surface.
Frozen Chamber Closing/Sealing Operation Log
One sealing operation at the time of the incident remains in the frozen chamber closing console's operation log. Nothing appears particularly out of order compared to usual shift-end sequences.
Other Zone Refrigerant System Inspection Log
Refrigerant system inspection log left by the refrigeration equipment technician that late night. Refrigerant pressure inspection work in another zone was scheduled for the day of the incident.
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Field Guide
One question = one turn. Examine the clues, shake statements with confrontations, question everyone, then accuse — there is no undo.
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