The story highlights an intense, symbiotic bond between two female protagonists. While romantic identifiers are not explicitly stated, the narrative prioritizes deep female-centric emotional connections.

The film centers on female agency and physical prowess within competitive synchronized swimming. Lee-young is portrayed as a complex, active character with an iron will rather than a passive trope.

Set within a South Korean social milieu, the film offers a non-Western perspective. It focuses on a culturally specific environment without detailing a multi-ethnic cast.

The mystery-thriller framework explores subjective morality and the instability of memory. It deconstructs idealized social bonds through a lens of nuanced social realism.

The plot uses memory loss following a traumatic accident as a central driver. This provides a platform to explore cognitive disability and a character's fractured reality.