Pre-existing friends are forced into debt-driven psychological games, distinguishing it from stranger-thrown-together thriller structures.
Tone shifts considerably darker as the series progresses — later content differs notably from the opening arc.
It shares some structural similarities but distinguishes itself by centering on pre-existing friendship under betrayal pressure, rather than strangers thrown together.
No — it becomes notably darker and more morally ambiguous as it progresses compared to its earlier episodes.