The headquarters of the Distortion Management Bureau's Special Investigation Division was located in the heart of the city. It looked like an ordinary public institution building, with a harmless sign in the lobby reading 'Urban Safety Research Institute.' Only after passing through the security gates behind the elevator three times did the investigators' real office finally appear.

Mapo-gu, Seoul. 8:00 AM.

7th Floor, Korea Branch of the Special Investigation Division, Distortion Management Bureau. Along the corridor where fluorescent lights flickered intermittently, the sound of low-heeled shoes clicked steadily.

On the first day of the investigator assignment, an unopened employee ID envelope and a stack of documents sat on Choi Yi-hyun's desk. One wall of the office was covered with graphs showing the frequency of Distortion occurrences in Seoul. Most of the seats were empty; in a department with frequent field dispatches, a quiet office was actually the norm. Outside the window, an ordinary Seoul morning was passing by, and the people outside would never dream that words like 'Distortion' or 'Distortion-ification' were being exchanged inside this building.

It was the first day of work for the rookie investigator, Guest.

As the employee ID envelope on the desk was opened, a single card slid out from inside.