What Is Saju? Korean Four Pillars Explained for Beginners

For a concise overview, start with the Saju guide. This article goes further into the chart and how to read it.

Saju (사주, 四柱) is the Korean name for the Four Pillars: a traditional way of turning your birth year, month, day and hour into eight Chinese characters, then reading those characters as a portrait of temperament, relationships and timing. Think of it as a very old personality map drawn with a calendar instead of a telescope.

The word literally means “four pillars.” The fuller phrase is saju palja (사주팔자, 四柱八字), “four pillars, eight characters.” Each pillar holds two characters, so four pillars give you eight.

If you have ever sat in a Seoul café while a reader wrote strange characters on a notepad and said “you’re a candle-flame type,” you have met saju. This guide explains what those characters are, where they come from, and how a reading is put together, without any spooky stuff.

Where saju comes from

Saju belongs to a family of East Asian birth-chart systems. In China it is usually called BaZi, “eight characters,” and in Japan it is known as shichū suimei (四柱推命). The system took its classic shape in China: a Tang-dynasty scholar, Li Xuzhong, is credited with reading the year, month and day of birth, and the Song-dynasty scholar Xu Ziping is credited with adding the hour to make four pillars.

In Korea the practice goes back at least to the Goryeo dynasty (918–1392). Over the centuries Korean readers kept the same structure but developed their own habits, vocabulary and favourite techniques. Today saju is part of everyday Korean culture. In a 2026 Embrain Trend Monitor survey of 1,200 Koreans aged 13 to 69, 62.3% said they had used a fortune-telling service, and interest in saju or tarot was highest among teenagers (71.5%) and people in their 20s (68.0%). Tellingly, 73.3% said they only take the advice that seems worth hearing, as a reference.

Saju has also become a travel experience. The Korea Herald reported in 2025 that saju cafés in Hongdae and Myeong-dong serve foreign visitors, and that the Seoul Tourism Organization began promoting them as a tourism product in 2024.

The building blocks: stems, branches and five elements

Every saju character comes from one of two sets.

10 Heavenly Stems (천간 cheongan, 天干): 甲 gap, 乙 eul, 丙 byeong, 丁 jeong, 戊 mu, 己 gi, 庚 gyeong, 辛 sin, 壬 im, 癸 gye.
12 Earthly Branches (지지 jiji, 地支): the twelve zodiac animals, from 子 ja (Rat) to 亥 hae (Pig).

Pair a stem with a branch and you get one of 60 combinations, the sexagenary or gapja cycle. That cycle has been used to label days since the oracle bones of Shang China, and later to label years, months and hours too.

Each stem and branch carries one of the five elements, or ohaeng (오행, 五行): wood, fire, earth, metal and water. Each also leans yin or yang. The elements relate in two basic loops:

Loop	Order
Generating (상생 sangsaeng)	wood → fire → earth → metal → water → wood
Controlling (상극 sanggeuk)	wood → earth → water → fire → metal → wood

Wood feeds fire, fire leaves ash that becomes earth, and so on. In saju symbolism, a chart is a small ecosystem, and reading it means noticing what grows, what burns and what is missing.

The four pillars and the “you” of the chart

Your four pillars are simply the stem-and-branch labels for your birth year, month, day and hour.

Pillar	Traditionally read for
Year (년주)	roots, early life, the wider social world
Month (월주)	upbringing, family climate, the season you were born into
Day (일주)	yourself and your closest partnership
Hour (시주)	later life, private hopes, your inner self

The most important single character is the stem of your day pillar. Koreans call it the ilgan (일간, 日干), the day master. It stands for you, and every other character is read in relation to it. A 丙 byeong day master is traditionally pictured as the sun, bright and generous. A 癸 gye day master is pictured as rain or dew, quiet and nourishing.

Two calendar details surprise beginners. First, the saju year starts at Ipchun (입춘, 立春), the “start of spring” solar term around February 4, not on January 1 or on Seollal, the Lunar New Year. Second, saju months change on solar terms, so a saju month does not line up neatly with a calendar month. Everyday zodiac chat in Korea (“what’s your ddi?”) often uses the Lunar New Year or even January 1. Both habits are normal; saju just uses its own start line.

How a saju reading works

A reader, or an app, first converts your birth details into the eight characters using an almanac called a manseryeok (만세력, 萬歲曆). Then they usually look at:

The day master: its element and whether the chart supports it or drains it.
Element balance: which of the five elements are plentiful, scarce or absent.
The ten gods (십성 sipseong): labels for how every character relates to the day master, such as “Peer,” “Creator,” “Steady wealth” or “Nurturing mentor.”
Branch relationships: harmonies such as samhap (삼합, three harmonies) and tensions such as chung (충, clash).
Timing: 10-year luck pillars (대운 daeun) and the pillar of the current year (세운 seun). For example, 2026 is a 丙午 byeong-o, Fire Horse, year.

A good reading sounds less like a verdict and more like a conversation: “Your chart leans heavily on fire; where in your life do you feel over-heated?” Practitioners say the chart describes tendencies and seasons, not fixed outcomes.

What saju is, and what it isn’t

Saju is a cultural tradition with a long literary history and a big place in modern Korean life. It is not a science. Studies of birth-chart systems, most famously Shawn Carlson’s 1985 double-blind test of Western astrology in Nature, have not found that charts match personalities better than chance. Psychologists also describe the Barnum effect: we tend to see ourselves in vague, flattering descriptions.

So why bother? Because a saju chart is a great prompt for self-reflection. It gives you a vocabulary (fire, water, Peer, Rival) for talking about how you work, rest and relate. Many Koreans treat it the way that survey suggests: as a reference, taken with a smile.

FAQ

What does saju mean in Korean?

Saju (사주, 四柱) means “four pillars.” It refers to the four stem-and-branch pairs made from your birth year, month, day and hour. The longer phrase saju palja (사주팔자) means “four pillars, eight characters,” because each pillar holds two characters. In everyday Korean, “saju” is also shorthand for getting your fortune read, as in “let’s go see a saju reader.”

Is saju the same as Chinese BaZi?

They share the same structure: four pillars, ten stems, twelve branches and five elements. BaZi is the Chinese name, saju the Korean one, and Japan calls it shichū suimei. The differences are mostly in habits, vocabulary and which techniques readers emphasize. Korean saju culture, for example, puts a lot of energy into gunghap (궁합), or compatibility, and into the saju-café experience.

Do I need my exact birth time for saju?

It helps, because the hour gives you the fourth pillar. Without it you still get three pillars, or six of the eight characters, including your day master. That is enough for a meaningful look at your core element and much of your chart’s balance. If you do know the time, readers may also adjust it for local clock history and true solar time.

Can saju tell my future?

Saju is traditionally read for tendencies and timing themes, not fixed events. Controlled tests of birth charts have not shown that they reliably establish future outcomes, and responsible readers frame their comments as possibilities to reflect on. The healthiest way to use a reading is as a mirror: keep what feels useful, question what doesn’t, and make real decisions with real information.

Try it with the Moon Rabbit

Curious what your own eight characters look like? The Moon Rabbit can draw your free saju card in about 30 seconds, no sign-up needed, at SajuBunny. If you’d like to see what a full reading sounds like first, browse the sample readings.

Saju is a cultural tradition, not a science. SajuBunny readings are for fun and self-reflection, not professional advice.

Sources

For fun and self-reflection. Saju is a traditional way of looking at yourself, not a prediction or professional advice.