Honestly, a twist? The whole thing is a descent, a spiral, where every 'revelation' just digs the pit deeper. The basement reveal in the first chapters sets the tone, sure. But I'd argue the biggest shock for me wasn't a plot point but the slow, terrible recognition of who Sangwoo actually is. It's not a single event; it's the moment when Yoon Bum's desperate hope for affection shatters completely, and you realize this story isn't about escape, it's about the prison of trauma. That psychological turn, where sympathy curdles into horror, hit harder than any physical discovery.
People talk about the mom's body, the dad's 'suicide', those are big. But the twist is in the reader's own shifting perspective. You start off terrified for Bum, then you get these glimpses that make you question his reliability, then you're just... trapped with them. The book plays with your expectations of a victim-hero narrative and systematically dismantles it. The final phone call at the end, the sheer banality of the conclusion, that felt like the cruelest twist of all—no catharsis, just an echo.