The ABO Myth: A Deep Dive into South Korea's Blood Type Obsession

Introduction: The First Date Question

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If you find yourself on a blind date in Seoul, after the standard questions about your job and hobbies, you will almost certainly be asked: "What is your blood type?" For many Westerners, this sounds like a medical inquiry. In South Korea, however, it is a psychological profile. Despite a complete lack of scientific evidence, the ABO Blood Type Personality Theory remains a persistent cultural filter used to judge compatibility, temperament, and even career suitability.

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1. The Archetypes: From 'Social A' to 'Selfish B'

The Korean blood type myth divides humanity into four distinct boxes:

• Type A (The Farmer): Perceived as diligent, perfectionist, and considerate, but also timid and prone to overthinking. They are the ideal "team players" in the corporate world.
• Type B (The Hunter): The most controversial type, especially for men. They are seen as creative, passionate, and independent, but also selfish and irresponsible in relationships. The movie "My Boyfriend is Type B" solidified this stereotype in the national psyche.
• Type O (The Warrior): Seen as outgoing, natural leaders, and deeply ambitious. They are the social butterflies who hold groups together.
• Type AB (The Humanist/Alien): Often described as either a genius or a complete eccentric. They are perceived as hyper-rational but emotionally detached.

2. A Dark History: From Eugenics to Pop Culture

The roots of this obsession are not Korean. The theory was popularized in Japan during the 1920s and 30s, often used by the military to categorize soldiers. It reached South Korea in the late 20th century, where it was stripped of its darker connotations and repackaged as harmless pop-psychology.

Why does it persist? In a hyper-competitive, high-context society like Korea, people crave shortcuts to understand others. Blood types provide a low-stakes vocabulary to discuss personality without the awkwardness of direct confrontation.

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3. The New Rival: MBTI and the Evolution of the Label

While blood types held the throne for decades, the younger generation (MZ Generation) has moved toward the MBTI (Myers-Briggs Type Indicator). However, the underlying motivation remains the same: a desire to categorize and simplify the social world. Whether it's being an "INFJ" or an "O-type," the goal is to find a sense of belonging in a society that often feels cold and transactional.

Conclusion: Blood is Thicker Than Facts

Even if a Korean tells you they "don't believe in blood types," they still know the stereotypes by heart. It is a cultural grammar that won't disappear easily. So, the next time someone asks for your blood type, don't give them a medical lecture. Just tell them your type and enjoy the psychological game that follows.

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Video Insight: The Blood Type Game