Saju vs BaZi vs Shichusuimei: One Root, Three Local Habits

See the Saju and BaZi guide for a short comparison. This article also looks at Japanese Shichusuimei and local reading habits.

Short answer: Korean saju, Chinese BaZi and Japanese shichusuimei are the same system with three local accents. All three turn a birth year, month, day and hour into four stem-and-branch pillars, or eight characters, and read them through yin-yang and the five elements. The differences live in vocabulary, calendar habits and which techniques each culture loves most.

It is a bit like one recipe cooked in three kitchens. The ingredients match. The seasoning, the serving style and the dinner-table conversation don’t.

Here is what is shared, what is local, and why the Moon Rabbit thinks the local bits are the fun part.

One structure, three names

	Name	Script	Literal meaning
China	BaZi	八字	“eight characters”
Korea	Saju, saju palja	사주, 四柱 / 사주팔자	“four pillars” / “four pillars, eight characters”
Japan	Shichū suimei	四柱推命	“four pillars destiny inference”

The system took shape in China. A Tang-dynasty scholar, Li Xuzhong, is credited with reading the year, month and day of birth. The Song-dynasty scholar Xu Ziping is credited with adding the hour, which is why the four-pillar method is also called the Ziping method. From there it spread. In Korea the practice goes back at least to the Goryeo dynasty (918–1392), and in Japan it arrived through exchanges with China and Korea.

Everywhere, the core toolkit is identical:

10 Heavenly Stems, from 甲 to 癸
12 Earthly Branches, the zodiac animals
the 60-combination sexagenary cycle
five elements with generating and controlling loops
the day stem as the self, called the day master
ten-year luck cycles layered over the birth chart

So if a Chinese BaZi reader and a Korean saju reader calculate the same birth moment with the same rules, they get the same eight characters.

What feels distinctly Korean

The words. Korean readers call the day master ilgan (일간, 日干) and the ten relationships sipseong (십성, 十星). The ten-year luck pillars are daeun (대운), the yearly pillar is seun (세운), and the almanac used to look up pillars is the manseryeok (만세력, 萬歲曆). Stems keep Korean readings, so 甲 is gap, not jiǎ. The stems even show up outside fortune-telling: in Korean contracts, gap (갑, 甲) names the first party and eul (을, 乙) the second.

Gunghap culture. Gunghap (궁합, 宮合), comparing two people’s charts, is a well-loved Korean tradition, historically consulted around marriage. Today it is mostly a playful conversation starter between couples and friends. Practitioners also popularized branch pairs called wonjin (원진, 怨嗔), sometimes translated as “resentment” pairs, such as 子未 Rat and Goat. They are best read as a nudge to communicate, not as a verdict.

The saju café. Walk through Hongdae or Myeong-dong and you’ll find cafés where a reader works through your chart over coffee. The Korea Herald reported in 2025 that such cafés serve many foreign visitors, cited 50,000 won for a 30-minute session, and noted that the Seoul Tourism Organization began promoting saju cafés as a tourism product in 2024.

Casual reference culture. In a 2026 Embrain Trend Monitor survey of 1,200 Koreans aged 13 to 69, 62.3% had used a fortune-telling service, and 73.3% said they only take advice worth hearing as reference. YouTube was the main channel for 60.4%. That “take it as reference” attitude is very characteristic.

Korean clock quirks. Korea’s standard time has moved around. It was UTC+8:30 from 1954 to 1961, and daylight saving time was used in some years, including 1987 and 1988 around the Seoul Olympics. Careful Korean readers adjust for this, and many also apply true solar time: Seoul sits near 127°E, about 32 minutes behind the 135°E meridian behind UTC+9.

Zodiac animal names. The Korean zodiac says Pig (돼지) for 亥 and uses yang (양), usually translated Sheep or Goat, for 未.

What feels distinctly Chinese

BaZi is practised widely in mainland China, Taiwan, Hong Kong, Singapore, Malaysia and diaspora communities, often alongside feng shui. Chinese sources usually call the day master rìzhǔ (日主) or rìgān (日干), and the classic texts, such as Yuanhai Ziping, were compiled and revised in China over centuries. If you read English-language BaZi material, you’ll meet translated ten-god names such as “Eating God,” “Hurting Officer” and “Seven Killings.” Korean apps, SajuBunny included, often prefer softer plain-English labels like Creator, Rebel/Performer and Challenger.

What feels distinctly Japanese

In Japan, shichū suimei is practised by professional fortune-tellers (占い師 uranaishi) and sits alongside Zi Wei Dou Shu and Western astrology in the fortune-telling mix. Japanese has its own readings for the stems, such as kinoe (木の兄) for 甲, “elder brother of wood,” which shows the yin-yang idea right in the name. The Japanese zodiac says Wild Boar (inoshishi) where Korea says Pig, and Sheep for 未. Japan also moved its New Year to 1 January in 1873, which shapes how casual zodiac-year talk works there.

Shared, but debated everywhere

Some questions don’t split neatly by country. They split by school:

Where the year starts. Most four-pillar readers start the year at Ipchun (입춘, 立春, around February 4), not at the Lunar New Year. Everyday zodiac talk in all three cultures often uses the Lunar New Year or even January 1. Neither habit is “wrong”; they serve different purposes.
The midnight Rat hour. The 子 ja hour runs 23:00–01:00, so does a baby born at 23:30 belong to today or tomorrow? Some Korean schools split it into yajasi (야자시, 夜子時) and jojasi (조자시, 朝子時), the “night” and “morning” Rat hours.
Strength and balance. How to judge whether a day master is strong, and which element balances it (용신 yongsin), varies a lot between teachers.

The 60th birthday shows the family resemblance nicely. Korea celebrates hwangap (환갑, 還甲) and Japan kanreki (還暦), both marking the return of your birth year’s stem-branch pair after one full 60-year cycle.

FAQ

Is Korean saju the same as Chinese BaZi?

Structurally, yes. Both use four pillars of stem-and-branch pairs, five elements, the day stem as the self, and ten-year luck cycles. Given the same calculation rules, they produce the same eight characters. The differences are cultural: Korean vocabulary, the popularity of gunghap and saju cafés, Korean clock-history adjustments, and the plain-language style many Korean apps use when explaining the ten relationships.

What is shichusuimei?

Shichū suimei (四柱推命) is the Japanese name for the Four Pillars, meaning roughly “four pillars destiny inference.” It uses the same stems, branches and elements as BaZi and saju. In Japan it is offered by professional fortune-tellers alongside other methods such as Zi Wei Dou Shu and Western astrology, and it uses Japanese readings for the stems and zodiac animals.

Will a Chinese and a Korean app give me the same chart?

Often, but not always. Differences come from settings rather than culture: whether the app applies true solar time, how it treats the late-night Rat hour, which time zone history it uses for your birth year, and whether the year starts at Ipchun. If two apps disagree, compare those settings first. The interpretation text will differ too, since each writer has their own style.

Which tradition should I start with?

Start with whichever language you enjoy reading. The underlying chart is the same, so skills transfer easily. If you’re drawn to Korean culture, saju gives you the Korean words, gunghap traditions and café culture. If you want the classic texts, much of that literature is Chinese. Whichever you choose, treat it as a cultural lens for reflection, not a rulebook.

Try it with the Moon Rabbit

Curious how your eight characters look in Korean style? Get your free saju card from the Moon Rabbit, then open the pro manseryeok chart to see every stem, branch and luck pillar laid out.

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.