Push the button for the 4th floor in a Korean elevator and you might find it labeled F. Order seaweed soup on exam morning and a worried family member will steer you away from it. Dream of a pig? You could be in for some luck. Korea has a wonderfully layered world of superstitions, folk beliefs, and cultural customs that have survived centuries of modernisation — and travelers will bump into them whether they know it or not.
This guide explains the most common beliefs you’ll encounter, where they come from, and how seriously people take them today. The short answer: some Koreans follow them devoutly, others treat them as fun folklore, and many do both depending on the occasion.
Last updated: June 2026.
The Number 4 and the Elevator F Button
The most visible superstition in Korea is the fear of the number 4, known as tetraphobia. In Korean (and in Sino-Korean, the formal number system), the word for four — sa (사) — is a homophone of the character for death (死, also sa). This association is taken seriously enough that many buildings simply skip the number altogether.
In apartment blocks, hospitals, and hotels across the country, the 4th floor button is often labeled F (for four) or replaced by an asterisk. Some buildings jump straight from the 3rd to the 5th floor. You’ll also notice that many apartment complexes number their units starting at 101, 201, and so on — partly to avoid 4 in any prominent position.
This isn’t unique to Korea — the same avoidance exists across much of East Asia — but in Korea it’s particularly widespread in hospital and senior-living contexts, where the association with death feels most uncomfortable. Younger Koreans often laugh it off as outdated, but the architectural decisions persist.
Writing Someone’s Name in Red
If you’re writing a name card or signing a birthday message in Korea, reach for any pen colour but red. Writing a person’s name in red ink is widely considered bad luck — and in some interpretations, a death omen. The association comes from the historical practice of writing the names of the deceased in red in family genealogy records and on grave markers.
Writing a living person’s name in red can therefore feel like you’re symbolically marking them as dead. Most Koreans today know exactly why it’s taboo, and many — especially older generations — still feel genuinely uncomfortable receiving red-ink name cards or thank-you notes.
Practically speaking: if you’re a teacher, a guide, or anyone handing out written materials in Korea, use black or blue. It’s a small thing, but it’s noticed. For more on the cultural layer underneath Korean daily life, see our guide to jeong, nunchi, and pali-pali.
Fan Death — Korea’s Most Famous Urban Legend
Few Korean superstitions have puzzled outsiders more than fan death — the belief that sleeping in a closed room with an electric fan running overnight can be fatal. Warnings about this appear in Korean news articles, on product safety labels, and in parental advice. Many Korean electric fans are sold with built-in timers, ostensibly for this reason.
The scientific consensus is that fan death is a myth: electric fans circulate air without depleting oxygen or creating dangerous conditions in a normal room. The belief may have originated from cases of heatstroke or hypothermia that were misattributed to fan use, or from government-era messaging in the 1970s and 80s that encouraged energy saving. It may also have served as a convenient explanation for unexplained deaths in people who were found with fans running.
Today, the majority of younger Koreans and most urban professionals treat fan death as folklore. However, many older Koreans — including some doctors — still take the precaution of opening a window or using the timer. If your host turns off your room fan overnight, this is probably why.
Exam Day: Seaweed Soup, Yeot, and Forks
Korea’s university entrance exam — the suneung (수능) — is one of the most high-stakes single days in a student’s life. Around it has grown a whole ecosystem of food superstitions.
Miyeok-guk (미역국, seaweed soup) is normally a beloved dish — it’s traditionally eaten on birthdays because mothers are given it after childbirth. But on exam day, many families carefully avoid it. The reason: the slippery texture of seaweed is thought to symbolise slipping or failing, particularly the idea of “sliding off” a result. Eating it before the exam is considered bad luck.
On the positive side, yeot (엿) — a sticky Korean taffy — is a popular exam gift. The stickiness symbolises “sticking to” the answer or the exam result holding fast. Similarly, families give chocolate and chapssal-tteok (찹쌀떡), glutinous rice cakes, for the same sticky-equals-success symbolism.
Forks are sometimes avoided as gifts for exam students because the Korean word for fork (po-keu) can sound like a fail or mess. Instead, a spoon — which “scoops up” success — is preferred. These customs are largely playful today, but plenty of parents still observe them earnestly.
Pig Dreams and the Luck of 복 (Bok)
In Korean folk tradition, dreaming of a pig — especially a plump, golden, or numerous pig — is considered a powerful sign of incoming good fortune, particularly financial luck. Pig dreams (dwaeji kkum, 돼지꿈) are taken seriously enough that many people buy lottery tickets the morning after having one.
The pig as a lucky symbol has deep roots. Pigs represented wealth and abundance in agrarian Korea — a household with pigs was a prosperous one. The pig is also one of the twelve animals of the Korean zodiac, and those born in the Year of the Pig are often considered generous, hardworking, and fortunate.
The concept of bok (복) — blessing, good fortune, luck — runs through many Korean cultural practices. You’ll see it on decorative wall hangings, embroidered cushions, and folding fans, often written in Chinese characters. The bokjumeoni (복주머니), a small embroidered pouch, is a traditional new year gift meant to hold and attract bok. When Koreans wish someone well, phrases invoking bok are common across all generations.
Naming, Saju, and Matchmaking
Korea has a long tradition of saju (사주) — the “four pillars of destiny,” a system of fortune-telling based on the year, month, day, and hour of a person’s birth. A saju reading analyses the balance of the five elements (wood, fire, earth, metal, water) across those pillars to predict personality, fortune, and compatibility.
Before a couple marries, it’s still common — especially in families where parents have a strong say — to have a gunghap (궁합) reading, which checks whether the couple’s saju are compatible. An incompatible reading doesn’t necessarily stop a marriage, but it can prompt discussion. Online gunghap calculators are popular with younger Koreans who take it half-seriously, half as entertainment.
Naming is another area where superstition and belief overlap with serious decision-making. Many Korean parents consult a jak명가 (작명가), a professional name-giver, who analyses the stroke count of Chinese characters and their elemental balance to find a name that will bring good fortune to the child. A name can be changed later in life for the same reasons — to improve luck or correct an imbalance.
These practices sit somewhere between tradition, spirituality, and practicality for most modern Koreans. They’re worth knowing because they explain why Koreans might ask your birth date early in a conversation — not rudeness, but curiosity. Our Korean etiquette guide has more on how these cultural habits shape everyday interactions.
Moving Day: Picking an Auspicious Date
Moving house in Korea is rarely done on a whim — many families consult a calendar to pick a son-eomneun nal (손 없는 날), literally a “day with no hands.” In Korean folk belief, harmful spirits (son) roam in different directions on different days of the lunar calendar. On days when the son are absent — traditionally every 9th and 10th day of the lunar month — there’s no bad spirit to interfere with your move.
Moving companies in Korea are well aware of this. Prices spike sharply on son-eomneun nal because demand is so high. The most auspicious days can be booked out months in advance, and budget-conscious families sometimes choose slightly less lucky dates simply to save money on the moving truck.
The same principle — choosing an auspicious date — applies to business openings, weddings, and major purchases. This is why your Korean colleague might tell you they’re buying a car on a particular date, not just when the deal is finalised. Knowing a few Korean phrases can help you navigate these conversations with warmth rather than confusion.
How to Approach These Beliefs as a Traveler
Korean superstitions span a wide spectrum — from architectural decisions embedded in every building to casual jokes between friends. A few things are worth keeping in mind:
- Don’t mock or dismiss them in company. Even people who don’t personally believe in fan death or lucky pig dreams may have family members who do. Treat them with the same respect you’d give any cultural tradition.
- You won’t be expected to follow them. Koreans generally don’t expect foreign visitors to know or observe these customs. Observing them anyway — declining to write a name in red, for example — will be noticed and appreciated.
- They’re a great conversation starter. Asking a Korean friend which of these they actually believe is a warm, lively topic that reveals a lot about the intersection of modernity and tradition in Korean society.
Korea is a country that has sprinted through industrialisation and digital modernity while keeping one foot in a rich folk tradition. The superstitions here aren’t remnants of a primitive past — they’re living parts of a culture that makes room for both skyscrapers and lucky pig dreams.
Frequently Asked Questions
Why do Korean buildings skip the 4th floor?
In Korean (and Sino-Korean), the word for four — 사 (sa) — sounds identical to the word for death (死). To avoid the association, many buildings label the 4th floor as 'F' or skip it entirely, jumping from floor 3 to floor 5. The practice is especially common in hospitals and residential buildings.
Is fan death a real danger?
No. There is no scientific evidence that sleeping with an electric fan running in a normal room causes death. The belief is a Korean urban legend, possibly rooted in misattributed deaths or mid-20th-century energy-conservation messaging. Most younger Koreans treat it as folklore, though some older generations still observe the precaution of leaving a window open.
Why shouldn't you eat seaweed soup on exam day in Korea?
Miyeok-guk (seaweed soup) is avoided on exam day because the slippery texture of seaweed is associated with 'slipping' or failing — sliding off the desired result. Instead, families give sticky foods like yeot (taffy) or glutinous rice cakes, whose stickiness symbolises success holding fast.
What does it mean to dream of a pig in Korea?
Dreaming of a pig — especially a plump or golden one — is considered a very lucky omen in Korean folk tradition, associated particularly with incoming wealth or financial good fortune. Many people buy lottery tickets after having a pig dream. The pig's association with prosperity comes from its historical role as a symbol of abundance in agrarian Korean households.
What is saju and is it still used in modern Korea?
Saju (사주) is a traditional Korean fortune-telling system based on the four pillars of a person's birth: year, month, day, and hour. It's still widely consulted — particularly for relationship compatibility readings (gunghap) before marriage and for choosing auspicious names for newborns. Younger Koreans often engage with it as a fun cultural practice, while older generations may take the readings more seriously.