Korean Superstitions: Why the Number 4 Is Avoided and Red

Korean Superstitions: The Silent Language of Numbers and Colors

During my three decades covering stories across Korea—from the bustling streets of Gangnam to the quiet temples of Gyeongju—I learned that superstitions aren’t simply quaint folklore. They’re living, breathing customs that shape how millions of people make decisions every single day. One afternoon, while interviewing a hospital administrator in Seoul, she casually mentioned that the facility had no fourth floor. I thought she was joking. She wasn’t. This moment crystallized something I’d been observing for years: Korean superstitions, particularly those surrounding the number 4 and red ink, run far deeper than Western curiosity might suggest.

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Last updated: 2026-03-23

What outsiders often dismiss as superstition is actually a complex cultural inheritance—rooted in language, history, Buddhism, Confucianism, and centuries of collective experience. Understanding Korean superstitions isn’t about believing in them; it’s about understanding the Korean heart. As someone who served as KATUSA and later spent decades interviewing people from every walk of life, I came to see these practices as windows into how Koreans work through uncertainty, honor ancestors, and create meaning in an unpredictable world.

The Tetraphobia Connection: Why Four Is the Number to Avoid

Let me start with the most visible superstition in Korean society: the avoidance of the number 4. If you’ve ever been to Korea or stayed in a Korean hotel, you’ve probably noticed something peculiar. The elevator buttons skip from 3 directly to 5. The parking garage jumps from Level 3 to Level 5. Apartment buildings have no fourth floor. This phenomenon has a name: tetraphobia—the fear of the number four.

The reason is phonetic. In Korean, the word for “four” is sa (사), which sounds identical to the word for “death” (sa, 死). This linguistic coincidence has profound psychological weight in a culture that places tremendous emphasis on ancestors, mortality, and the boundary between life and the afterlife. When you hear “sa,” your brain doesn’t distinguish between “four” and “death”—it’s the same sound, the same vibration, the same omen.

I first truly understood this when my colleague’s mother fell ill during my early years as a journalist. The family was extremely careful to avoid scheduling her surgery on the fourth of any month. At the time, I found it almost charming—a cultural quirk. But watching the genuine anxiety in their faces when a doctor casually mentioned “the fourth,” I realized this wasn’t whimsy. It was a deep cultural reflex, as automatic as an American avoiding walking under a ladder.

The avoidance of 4 has created an entire infrastructure in Korea. Buildings use the number “F” instead of “4” on some floors. Phone numbers and license plates without the digit 4 command premium prices. Hospitals, hotels, and office buildings have spent enormous sums restructuring their numbering systems to accommodate this superstition. It’s not that Koreans are irrational; it’s that they’ve collectively decided that honoring this cultural sensitivity is worth the practical inconvenience. When you understand Korean superstitions in this context, you see a society making deliberate choices about what matters to its collective well-being.

The Deeper Layers: History, Buddhism, and the Afterlife

To understand Korean superstitions fully, you need to understand that Korea sits at the intersection of several spiritual traditions. Buddhism, which arrived in Korea during the Three Kingdoms period (57 BCE – 668 CE), emphasizes the cyclical nature of existence and the importance of proper rituals. Confucianism, which became dominant during the Joseon Dynasty (1392-1910), stressed filial piety and ancestor veneration. These aren’t competing beliefs in Korean culture—they’re layers of the same foundation.

The number 4 superstition draws power from both traditions. In Buddhist cosmology, death isn’t an ending but a transition. In Confucian culture, one’s obligations to ancestors don’t diminish after death—they intensify. The avoidance of 4 is therefore not just fear; it’s respect. By refusing to invoke the word for death casually, Koreans are creating a kind of linguistic sanctuary around mortality.

This belief system extends to hospital visits. When visiting someone who is ill, you never bring four of anything—four flowers, four gifts, four anything. The message would be catastrophic: “I’m wishing four-death upon you.” I’ve seen Korean families become visibly distressed when a well-meaning foreign visitor arrived with four orchids. The flowers were beautiful, the intention pure, but the cultural communication was unmistakably grim.

During my KATUSA service, I observed how these beliefs operated even in military contexts. Korean soldiers would avoid certain quarters or assignments if they involved the number 4. American servicemembers found it baffling until someone explained the history and the phonetic connection. Then it made a certain kind of sense—not as superstition, but as cultural memory.

Red Ink: Why Writing Names in Crimson Carries Lethal Meaning

If 4 is Korea’s most avoided number, red ink represents perhaps its most feared writing tool. The rule is simple but absolute: never write a person’s name in red ink. To do so, in traditional Korean belief, is to wish death upon that person. In extreme cases, it’s considered a curse.

The origins of this belief are less obvious than the number 4, but equally rooted in Korean superstitions and cultural practice. One prevailing theory traces it to the Joseon Dynasty funeral tradition. Bodies were sometimes marked with red ink or paint to indicate death or mourning status. Another explanation points to how names of deceased ancestors were written in red in genealogical records. Whatever the origin, the taboo became absolute: red ink on a name equals death.

In modern Korea, this superstition persists with remarkable tenacity. Teachers avoid grading papers in red ink, or they’re very careful never to mark a student’s name in red. Hospital staff understand never to write a patient’s name on medical records in red. When signing important documents, Koreans instinctively choose black or blue ink. I’ve watched business meetings pause briefly while someone found a pen in the “correct” color. No one makes a fuss; everyone just understands.

What struck me most powerfully was observing this rule in schools. Young children, who have no conscious memory of why this rule exists, follow it automatically. When I asked a seven-year-old why she was upset that her teacher had used red marker to write her name on the board, she couldn’t articulate the reason—she just knew it felt wrong, dangerous, ominous. This is how superstitions survive: not through logical argument, but through embodied cultural knowledge passed from generation to generation.

Korean Superstitions in the Modern World: Persistence and Evolution

One of the great surprises of my later years in journalism was discovering that Korean superstitions haven’t faded with modernization—they’ve adapted. South Korea is one of the world’s most technologically advanced nations, yet tetraphobia remains so prevalent that real estate developers still skip the fourth floor. This isn’t a rural phenomenon or an elderly person’s belief. It’s embraced by tech executives, young professionals, and university students.

When I interviewed an architect designing a luxury apartment complex in Gangnam, I asked why they were incorporating the “no fourth floor” design. His answer was pragmatic: “Our buyers expect it. It makes the units more marketable.” He wasn’t saying “I believe in the superstition”; he was saying “I understand that this belief shapes market value and buyer psychology.” That distinction is important. Korean superstitions have become embedded in the infrastructure itself.

The same applies to red ink. Despite living in a digital age where handwriting matters less, the taboo persists. Korean companies still follow strict protocols about pen colors for signatures and official documents. Digital interfaces in Korea often avoid showing names in red text. The superstition has simply migrated from pen to pixel.

What’s particularly interesting is how Korean superstitions interact with globalization. Korean businesses dealing with international partners have to work through the tension between honoring these beliefs and operating in a world that doesn’t share them. I covered a story about a Korean manufacturer whose German business partner wondered why they were being so particular about certain numbering systems and color protocols. The conversations that followed—explaining not just the what but the why of Korean superstitions—became crucial to cross-cultural understanding.

Beyond Superstition: Cultural Meaning and Collective Consciousness

Perhaps my most important realization, after decades of observing and reporting on Korean culture, is that dismissing Korean superstitions as irrational misses something essential. These aren’t primitive holdovers from a less educated past. They’re sophisticated cultural technologies for managing anxiety about mortality, honoring ancestors, and creating cohesion around shared meaning.

Every culture has superstitions—Americans avoid ladders and black cats, Europeans worry about the number 13, many cultures fear the evil eye. What makes Korean superstitions distinctive is their systematic integration into daily infrastructure and their remarkable persistence across class and education levels. This isn’t weakness; it’s coherence. A society where taxi drivers and CEOs, monks and software engineers all respect the same taboos about 4 and red ink is a society with powerful underlying cultural unity.

From my observations covering Korean life and culture, I believe we should understand Korean superstitions as expressions of what matters most to Korean consciousness: respect for ancestors, awareness of mortality, and the belief that language and symbols carry real power. When you stop seeing tetraphobia as irrational fear and start seeing it as a linguistic-cultural acknowledgment that words matter, that sounds carry meaning, that mortality is real and should be treated carefully—then the superstition becomes almost wise.

Red ink operates similarly. The refusal to write names in red isn’t paranoia; it’s a cultural practice that says: “Your name, your identity, your life are sacred. We don’t invoke death casually. We honor the boundary between living and dead through our careful choices about language and symbols.”

Traveling Through Korean Superstitions: Practical Wisdom

If you’re visiting Korea or working with Korean colleagues, understanding Korean superstitions isn’t just cultural appreciation—it’s practical courtesy. Avoid giving gifts in groups of four. If you’re writing something official, use black or blue ink for names. Be aware that scheduling important events on the fourth, fourteenth, or twenty-fourth might provoke subtle but genuine anxiety among Korean colleagues or friends.

None of this requires you to believe. My American friends sometimes joke that I’ve become superstitious after all my years in Korea. I haven’t—I’ve become respectful. There’s a difference. Respecting a culture’s meaning-making systems is one of the deepest forms of hospitality a visitor or colleague can offer.

Sound familiar?

Conclusion: Living with Meaning in an Uncertain World

After retiring from journalism and reflecting on what I’ve observed across three decades, I’ve come to see Korean superstitions—particularly the avoidance of 4 and the fear of red ink—as answers to fundamental human questions. How do we live with awareness of death? How do we honor those who came before us? How do we create order in a chaotic world? How do we maintain connection across generations?

Korean superstitions offer one coherent answer: through careful attention to language, symbols, and ritual. Through collective agreement that certain numbers and colors carry weight. Through building our physical and social infrastructure around these meanings. Whether you’re Korean or simply curious about how other cultures work through uncertainty, there’s wisdom here worth understanding.

The next time you see an elevator that jumps from 3 to 5, or notice that someone has carefully chosen a blue pen over a red one, remember: you’re not observing superstition. You’re witnessing a living culture’s careful choreography of respect, memory, and meaning.