The film "On the Line" does not feature any identifiable LGBTQ+ characters or themes. The narrative focuses on a voice phishing operation, and queer identity is not present in its plot or character development.

The film 'On the Line' is an action-crime thriller centered on voice phishing. Publicly available plot details, cast lists, and reviews do not indicate the presence of any transsexual characters or related themes. Therefore, the film has no identifiable depiction of transsexual individuals or issues.

The film primarily focuses on a male protagonist infiltrating a voice phishing organization. While there are female characters, none are depicted engaging in or winning close-quarters physical combat against male opponents.

This film is an original production and does not adapt characters from pre-existing source material, historical records, or previous installments. Therefore, no characters established as one gender were portrayed as a different gender.

This film is an original South Korean production, not an adaptation of pre-existing material, a biopic, or a reboot of established characters. Therefore, its characters do not have a prior canonical or historical race to be altered.