THE TELL
Arc 5: The Impersonation Directive

Open Case File · S1-ARC5-DEICE

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.

Scene

operational airport de-icing fluid storage and supply base—control room and support building in separate structures, connected by an underground walkway called the pipe gallery that personnel can traverse on foot · midwinter late night

5 suspects

  • Park Seung-gyuPark Seung-gyude-icing fluid supply control room night operatorForty-three. A man who lives by sequence and time, who considers doing exactly as instructed from above the most reliable way to handle work. Speaks little, never raises his voice, and when questioned answers precisely, starting with the time. Often says he was taught that changing sequence by one's own judgment is the most dangerous thing to do in the field. When pressed he does not retreat but rather speaks more clearly, and quietly but firmly resists any suggestion he did wrong.
  • Choi Yong-jinChoi Yong-jinpipe gallery equipment maintenance workerForty-five. Takes pride in hands-on work and openly dismisses paperwork. Loud voice, mixes in jokes, but turns defensive the moment his zone is mentioned. Cannot tolerate long questions and cuts people off, but will list in order what he touched and didn't touch.
  • Song Yeong-dalSong Yeong-dalprime contractor operations headquarters night-duty team leaderFifty-three. Long tenure at headquarters has given him the habit of treating the field like subordinates. Long sentences, arranges responsibility attribution in advance when speaking. When talk turns to documents he approved, his phrasing becomes noticeably cautious and he quickly shifts the topic to someone else's responsibility.
  • An Se-ukAn Se-ukairport operations support grievance and safety report handlerForty-seven. Long experience receiving and relaying interpersonal friction has taught him to gauge how much the other knows before stating his own opinion. Cautious speech, habit of not finishing sentences. When talk turns to matters that could endanger his position, he shifts the topic to paperwork.
  • Jeong Ha-yoonJeong Ha-yoonde-icing work and system operation records handlerThirty-two. Sensitive to times and numbers as befits someone who handles records, and doesn't say what isn't asked. Speech not fast, takes time choosing words. Becomes noticeably cautious when talk turns to people, doesn't volunteer remarks that would put colleagues in difficulty.

Exhibits

  • Night Contact Intake Log Review Copy

    External calls that came into this base that night are organized chronologically. Intake time, line, delivery-complete marking all filled in without omission—procedurally complete on the surface.

  • De-icing Fluid Supply System Operation Log

    02:14 emergency crossover valve open, 02:14–02:51 cross-flush cycle with both pipes opened to flow and rinse each other, 02:51 closure. The water shutoff step is not recorded at any time.

  • Pipe Gallery Work Log

    Insulation repair work was scheduled in the pipe gallery zone that night.

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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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Cross Flush · THE TELL Mystery Game