The Silent Sea is a South Korean science fiction mystery thriller series centered on a perilous mission to the moon. The narrative focuses on survival, scientific discovery, and ethical dilemmas, without featuring any identifiable LGBTQ+ characters or themes.

The film 'The Silent Sea' does not appear to include any transsexual characters or themes in its storyline or cast. Consequently, there is no depiction to evaluate regarding transsexual identities, leading to an N/A rating for its portrayal.

The movie does not contain any action or adventure elements.

The Silent Sea is an adaptation and expansion of the short film 'The Sea of Tranquility.' While the series develops its own set of characters, there is no clear evidence that any specific, named character from the original short film, with an established gender, was portrayed as a different gender in the series.

The Silent Sea (2021) is an original South Korean science fiction series. There is no prior source material, historical figures, or previous adaptations mentioned that would establish character races before this production. Thus, no race swap can be identified.