Chapter 4

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Yoon Seol-ah only wanted to confirm one mistake in the floor plan of the luxury apartment complex she was working on. But one number changed her life. 1708. A unit missing from the official floor plan, with no occupant, one that seemed never to have been built at all. Yet every night, the light behind its door came on. When Seol-ah began investigating, a message appeared on her phone: “Stop looking for Unit 1708 before they find you.” Not long afterward, Jang Do-yoon appeared. A man who knew far too much about the unit. A man who kept warning her to stop.

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