Historically, these relationships were governed by strict Confucian rules. There is an old Korean proverb: "Saj-dong-saeng are strangers you don't marry." This highlights the traditional boundary: they are family, but distinct from siblings. However, because they share the same surname and ancestral line, they are subject to strict "clan exogamy" taboos.
The portrayal of cousin-sister relationships and romantic storylines in Korean narratives offers a fascinating lens through which to explore themes of family, love, and societal norms. By delving into these dynamics with sensitivity and an understanding of Korean culture, creators can develop compelling stories that resonate with audiences. Good Cousin Sister -2019- Korean Sex Movie