The premise draws from the graphic novel Sandcastle but shifts emphasis to universal existential themes rather than the source's more prominent racial tensions between characters like the Algerian jeweler and the racist British doctor. Shyamalan retained only muted echoes of those dynamics, which remain peripheral subplots amid the rapid-aging horror.

The core narrative stays anchored in questions of time, trauma, and human fragility without any identity-politics framing or lectures. The film features a diverse ensemble cast of tourists including Gael García Bernal, Aaron Pierre, Nikki Amuka-Bird, and Ken Leung that aligns naturally with the international resort setting and introduces no source-character alterations or narrative emphasis on identity. Director intent remains focused on the horror of accelerated aging and interpersonal conflicts arising from it, with no activist messaging injected into character arcs or thematic development. This approach keeps progressive elements minimal and incidental, preserving the story's primary concern with mortality over any social agenda.