The film 'Detective K: Secret of Virtuous Widow' does not include any identifiable LGBTQ+ characters or themes. Cross-dressing occurs as a plot device for disguise, but it is not presented as an aspect of gender identity or sexual orientation, leading to a net impact of N/A.

The film does not feature identifiable transsexual characters or themes. A central plot twist involves a male character disguising himself as a woman for revenge, which is a narrative device distinct from the portrayal of transgender identity.

The film focuses on Detective K and his assistant investigating a murder and conspiracy. While a prominent female character, Han Gaek-ju, is central to the plot, she does not engage in or win direct physical combat against male opponents. No other female characters are depicted in significant physical action roles.

The film features original characters created for this specific movie series. There is no prior source material, historical record, or previous installment that establishes any character's gender differently from their on-screen portrayal.

This film is an original South Korean production set in the Joseon era, featuring original characters. There is no prior source material or historical record establishing characters of a different race that were subsequently changed.