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The brilliance of Chapter 1 lies in its subversion of the romance trope.
Chapter 1 sets a masterful, albeit disturbing, foundation for what would become a global sensation. The Hook: Obsession vs. Reality
Sangwoo reveals he has known about Bum’s stalking for months. He didn’t call the police because he found it “amusing.” The woman in the chair is revealed to be his own aunt (or in some translations, his stepmother — the text is ambiguous in ch.1, clarified later). Sangwoo has been torturing her for reasons not yet explained.
The chapter ends not with a kiss, but with a cage door closing. Bum has entered the house, but he will never leave.