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Posing as another applicant, Hyeok-jun joins a clinical trial where an unexpected encounter with his friend turns the job into a rescue mission.
After learning about Hyeok-jun's new job and the agency, his sister Ji-yoon's curiosity leads her to a night shift where her worst fears come to life.
With more questions than answers, Hyeok-jun accepts a night-shift job at a construction site and uncovers the real horror behind the mysterious agency.