Forbidden Dream is a historical drama centered on the scientific collaboration and friendship between King Sejong and Jang Yeong-sil. The narrative does not feature any identifiable LGBTQ+ characters or themes, focusing instead on historical events and the bond between the two male protagonists within a non-queer context.

Forbidden Dream is a historical drama focusing on King Sejong and Jang Yeong-sil's scientific collaboration. The narrative does not include any identifiable transsexual characters or themes, resulting in no depiction of transsexual identity within the film's plot or character arcs.

The movie does not contain any action or adventure elements.

Forbidden Dream is a historical drama depicting real-life figures King Sejong and Jang Yeong-sil. Both historical figures were male and are portrayed by male actors in the film, with no evidence of any established character being depicted with a different gender.

Forbidden Dream is a South Korean historical drama depicting real Korean historical figures from the Joseon Dynasty. The characters are portrayed by East Asian actors, consistent with their historical race, thus no race swap occurs.