Sea of Blood (Chosŏn'gŭl: 피바다) is the title of a North Korean opera credited to Kim Il-sung. It was first produced as an opera by Sea of Blood Theatrical Troupe ("Pibada Guekdan") in 1971. It was then later adapted into a novel by the Choseon Novelist Association of the 4.15 Culture Creation Group (Chosŏn'gŭl: 조선작가 동맹 4·15문학창작단) in 1973. Sea of Blood was also produced as a three-hour black-and-white film, rumored to have been directed partly by Kim Jong-il, the son of Kim Il-sung, in the early 1970s, which was produced by Korea Films.