Semantic Error (Korean: 시맨틱 에러; RR: Simaentik Ereo) is a 2022 South Korean streaming television series based on a homonymous BL web novel by Jeo Soo-ri, starring Park Seo-ham and Park Jae-chan. It premiered on February 16, 2022, on Watcha. The series' success turned it into a social phenomenon in South Korea, and introduced the BL genre to the mainstream media. The series was included on Teen Vogue's best BL dramas of 2022 list.The theatrical version of the series, Semantic Error: The Movie, was first screened at the 26th Bucheon International Fantastic Film Festival and commercially released in August 2022.