The Numbers Koreans Consider Lucky (and Why 4 Isn't One of Them)

Ride an elevator in an older Korean building and you may notice something odd: the button for the fourth floor sometimes reads “F” instead of “4.” It’s not a typo, and it’s not unique to Korea — the same avoidance shows up across China, Japan, and other parts of East Asia. The reason is linguistic: in Sino-Korean, the word for “four” (사, 四) is a near-homophone for the word for “death” (사, 死). Buildings, license plates, gift sets, and hospital room numbers have quietly worked around the coincidence for generations.

That’s the lucky-number story most visitors already half-know. The one most don’t is the older, more specific system sitting underneath it — element-based numbers, tied to the same five-element cosmology behind color and direction gaeunbeop.

Numbers and the Five Elements

Traditional Korean numerology assigns a number to each of the five elements, drawn from 낙서 (nakseo, the “Lo Shu” or river-writing square) — the same diagram that maps the five elements onto the cardinal directions used in pungsu (see our piece on why Korean bedrooms face a certain way). Numbers and directions come from the same source, which is why they line up:

• Wood — 3
• Fire — 9
• Earth — 5
• Metal — 7
• Water — 1

Worth being upfront about: this isn’t the only element-number system in circulation. A related but different diagram, 하도 (hado, the “Hetu” or river chart), pairs elements with numbers differently — and various regional and school-specific traditions layer more variations on top of both. What’s presented here is the Lo Shu-based version, treated as a starting point for a genuinely old and genuinely varied tradition, not a single settled formula.

The practical use is similar to color: if your chart is missing an element, or leans heavily toward one, the associated number becomes a small thing to favor — a preferred floor, a seat number, a quantity to buy in multiples of, a date to schedule something significant on.

Where the 4-Avoidance Actually Shows Up

The “no 4” superstition is real, but it’s worth being precise about how strongly it’s actually held today. It’s most visible in:

Buildings. Many Korean apartment complexes and hospitals skip or relabel the fourth floor, particularly in buildings from previous decades. Newer buildings are inconsistent — plenty simply use “4” without comment.

Gift-giving. Giving a set of four of something (four cups, four plates) is a minor faux pas in more traditional households, though it barely registers with younger, urban Koreans.

Hospital and funeral contexts. The association with death makes the number specifically sensitive around illness and mourning, more than in everyday commerce.

It’s genuinely a generational fade. A grandmother might wince at a gift of four items; her grandson likely won’t think twice.

The Number That Gets the Opposite Treatment

If 4 is Korea’s unlucky number, the closest thing to a universal lucky number is 7, largely through the same cultural osmosis that made it lucky in the West — reinforced, coincidentally, by its place as Metal’s number in the element system above. Whether that’s a genuine cultural throughline or two unrelated traditions landing on the same digit is, honestly, unresolved. Numerology tends to accumulate meaning from multiple directions at once, and untangling exactly which strand came from where is harder than the folk explanations usually let on.

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Want the lucky number tied to your own chart? Our Saju reading calculates your dominant element and includes its number as part of a full gaeunbeop card.