Open Case File · S1-ARC5-SLUDGE
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.
Scene
operational wastewater treatment plant sludge digestion & dewatering building · deep winter, dead of night
5 suspects
Park Se-aOperations log & instrumentation records officer (holds night operations qualification)Someone who speaks in hour-by-hour blocks. Does not volunteer what is not asked; cuts off ambiguity with 'That's not in my records.' Shows no emotion, but becomes visibly sensitive when her logs are questioned.
Oh Dae-ungDewatering equipment maintenance technicianTakes pride in hands-on work; words come before thought. Gets angry first when he feels suspected; once the anger subsides, explains in excessive detail. Lowers his voice when talking about others.
Kim Do-eonGas system night operatorCalm, procedure-following worker. When asked what he did, answers by ticking off times and steps one by one; memory is precise, so re-questioning does not shake his answers. Tends to confirm the scope of a question before answering; if the question is vague, asks back what is being asked.
Lee Mun-hoEquipment manufacturer technical support team leaderLong-winded technician who leads with evidence. Voice rises when procedure is mentioned; becomes defensive and cuts off sentences when the company name comes up. States grievance first, then answers the question.
Jeong Yun-giGrievance & safety reporting officerChooses words carefully, then ultimately answers briefly. Fluent when discussing paperwork, but trails off when asked what became of that paperwork. Apology shows in his face first.
Exhibits
Night Contact Intake Log
Twelve intakes from 22:00 to 04:00. Intake time, forwarding target, and completion status all filled without gaps; no unprocessed items. The 02:03 entry lists forwarding target only as 'digestion building night duty.'
Digester Gas System Operation Log
02:11 surplus gas discharge system opened, 02:13 digester agitation started, 02:43 agitation stopped, 02:46 discharge system closed. Times and intervals are precisely stamped.
Dewatering Line 2 Maintenance Work Log
Belt replacement work on dewatering line 2 that night. Tool issue 01:40, return 03:12. Two workers' signatures side by side.
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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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