Silmido (Korean: 실미도) is a 2003 South Korean action drama film directed by Kang Woo-suk. It is based on the 1999 novel Silmido by Baek Dong-ho, which in turn is based on the true story of Unit 684. Some parts of the film are dramatizations, as the actual details of certain events remain unknown. The film was both critically well received and a financial success, and was the first film in South Korea to attract a box office audience of over 10 million viewers.

The Blue House raid, also known in South Korea as the January 21 Incident, was a raid launched by North Korean commandos in an attempt to assassinate President of South Korea Park Chung Hee in his residence at the Blue House in Seoul, on January 21, 1968. A 31-man team of the Korean People's Army (KPA) infiltrated the DMZ but was intercepted by police near the residence. In the ensuing pursuit, all but two commandos were killed; one was captured, and one fled back to North Korea. South Korean casualties totaled 26 killed and 66 wounded, including about 24 civilians; four Americans also were killed. President Park was unharmed.