Yeoyeonsa

Yeonsa (연사) and yeosa (여사), collectively referred to as yeoyeonsa (여연사), are genres of Sandian fiction that revolve around same-sex relationships. Yeonsa follows male relationships, while yeosa revolves around female ones. Though most of them emphasize romance more than sex, some of them do contain homoerotic themes.

Yeoyeonsa works are often created by the opposite sex or an LGBT person of the same sex and marketed toward the opposite sex's heterosexuals. Yeonsa is a portmanteau of yeonson (년소, "boy") and rangsa (랑사, "love"), while yeosa mixes yeoson (녀소, "girl") and rangsa. Among other works, these genres are often present in hwaman, aenimo, post novels, video games, television dramas, and even aepoku.

The genres emerged in the mid-1980s, when male writers began drawing yeosa comics and selling them at independent hwaman shops, catching the attention of major publishers. In the late 1980s, the two genres became extremely popular with adult hwaman readers, especially young adults. In the 1990s, the trend of homosexual fiction spread to post novels and aenimo. By the mid-2000s. Concepts and themes associated with these works include crossdressers and narratives condemning homophobia.

Since the 2000s, as a result of the "Sandian boom", the genre has achieved popularity in the Anglosphere and surrounding Asian countries. Yeoyeonsa fan conventions are common in Sandia and the United States.