The belief in a link between blood types and personalities is common currency in Japan and South Korea. TV and magazines are rife with programs on the supposed connection, and many Japanese and Koreans casually ask others about their blood types to predict their inclinations.
在日本和南韓，認為血型與個性有關聯的信念是普遍流行的。電視與雜誌充斥著假想血型與個性相關的節目。許多日本人和韓國人隨意詢問別人的血型，以推測他們的性向。

According to popular belief, Type-A people are organized perfectionists, while Type-Os are strong leaders. The Type-AB indicates a person is rational and standoffish in public, but in private is creative and full of emotion. Type-B means a person puts personal freedom above community order, a taboo in East Asian culture.
一般相信，A型的人是有條理的完美主義者；O型是強勢的領導人；AB型的人對外顯得理性又冷漠，但是私底下卻富有創意又感情豐富；B型的人認為個人自由比社會秩序重要（這在東亞文化是一項禁忌）。

Many people look at blood types to analyze compatibility with potential romantic partners. The concept was turned into a hit romantic film in South Korea, "My Boyfriend is Type-B," about the turbulent times between a Type-A university student and her moody and destructive Type-B partner. But a backlash has gown against blood-type characterization after reports of Type-B children bullied at school. 
很多人以血型分析與潛在情侶的適合性。在南韓，這概念演變成一部熱賣的浪漫愛情片「我的B型男友」，關於一位A型大學生和她情緒化又有破壞性的B型伴侶之間的擾嚷經驗；導致B型小孩在學校被欺負的報導，而引發對血型個性化的反彈。

Psychologist Takeji Furukawa pioneered the field of blood type characterization in the 1920s. During World War II, the Japanese military used the notion to assign soldiers to tasks most appropriate to their personalities.
心理學家Takeji Furukawa在一九二○年代倡導血型個性化。第二次世界大戰期間，日本軍方利用這個概念為軍人分配最適合他們個性的工作。

 Toshitaka Nomi, a researcher of blood-type characterization who has studied the link for three decades, believes categorizing people by their blood types can lead to discrimination. Adults may laugh it off as entertainment. But it is not necessarily so among children. If studies in this area become more advanced, we can apply this to improve product marketing, human resource management, and education development.
Toshitaka Nomi對於血型與個性的關聯研究了三十年，他相信，以血型將人分類會導致歧視；成人可以當娛樂一笑置之，但小孩未必如此。如果在這領域的研究更先進，就可運用來改善產品的行銷、人力資源管理與教育發展。