Gunghap: How Koreans Check Couple Compatibility
Sooner or later, many people dating a Korean partner hear some version of the same request: could you share your exact birth date and time? Often a parent is asking, and the reason has a name. Gunghap (궁합, 宮合) is the traditional reading of a couple's compatibility through their saju, or Four Pillars charts. Here is what is being compared, why it still matters to some families, how Sajucheop turns it into a score, and how to take a disappointing number in stride.
Where gunghap shows up in Korean life
For centuries gunghap was part of the wedding itself. The Encyclopedia of Korean Culture places it inside napchae (납채, 納采), the betrothal step. The groom's family sent the bride's family a saju danja (사주단자, 四柱單子): a sheet of paper folded five or seven times, with the groom's year, month, day and hour of birth written in the middle, sealed in an envelope and bound with blue and red thread. The bride's family asked a diviner to read it for good and bad signs and to judge the couple's match. If the charts were found to carry harmful influences, the marriage could be called off. Otherwise the document was later packed with the bride's trousseau, to be kept in her wardrobe for the rest of her life.
Arranged marriages have given way to couples choosing each other, and the same encyclopedia notes the prevailing view that the custom will keep fading now that couples get to know each other before marrying. Still, it never quite left. Couples check it for fun at saju cafés, some parents ask for a reading before the two families meet, and in 2018 it carried a whole period comedy, The Princess and the Matchmaker, whose Korean title is simply Gunghap. A request for your birth time is usually curiosity or care, not a test you can fail.
Three ways to check a match
"Checking gunghap" can mean very different things, depending on how much of each chart is used.
| Method | What is compared | What you need | Limitation |
|---|---|---|---|
| Animal-sign match (띠 궁합, tti gunghap) | The branch of each birth year | Birth years | Everyone born in the same year gets the same answer |
| Day Master match | The stem of each birth day | Birth dates | Only the core temperament; 100 possible pairings |
| Full saju match | All eight characters of both charts | Birth dates and times | Without a birth time, six characters instead of eight |
Animal signs are the version most people know, but the year branch is only one character out of eight. The heart of a chart is the Day Pillar: the Day Master (일간, ilgan), the stem that stands for you, and the Day Branch (일지, ilji) beneath it, traditionally called the spouse palace. A serious gunghap reading therefore starts from the two Day Pillars.
What is actually compared
1. The two Day Masters
The ten stems relate to each other in five ways. Five pairs combine (합, hap): 甲己, 乙庚, 丙辛, 丁壬 and 戊癸, read as a pull toward each other that creates something neither has alone. Four pairs clash (충, chung): 甲庚, 乙辛, 丙壬 and 丁癸, two natures meeting head-on. Yang and Yin Earth (戊 and 己) clash with nobody. Every other pairing either shares an element, has one element feeding the other (Wood feeds Fire, Fire feeds Earth, Earth feeds Metal, Metal feeds Water, Water feeds Wood), or has one element controlling the other. Our Day Master compatibility table lays out all 100 pairings.
2. The two Day Branches
This is the texture of daily life together: sleep, pace, habits, the feel of a shared home. Six pairs form a six harmony (육합): 子丑, 寅亥, 卯戌, 辰酉, 巳申 and 午未. Branches from the same trine (삼합), such as 申子辰 or 寅午戌, pull in one direction like teammates. Six pairs clash: 子午, 丑未, 寅申, 卯酉, 辰戌 and 巳亥.
3. Elements that fill each other's gaps
If one chart has none of an element and the other carries it, the two are said to complete each other. It is the most intuitive part of gunghap, and many couples find it the most persuasive.
4. Wonjin, the quiet irritant
Korean tradition watches one more branch relationship closely: wonjin (원진, 怨嗔), "resentment," found in the pairs 子未, 丑午, 寅酉, 卯申, 辰亥 and 巳戌. Old rhymes explain it with animal quirks, such as the Rat that cannot stand the Goat's horns. It describes friction that builds from small differences rather than open fights. Our birth-year animal chart counts it as a friction; the Day Pillar match score leaves it out. The other named patterns of this kind are covered in our guide to Peach Blossom and the special stars.
One structural detail surprises most people. In the sixty pillars, yang stems sit only on yang branches and yin stems only on yin ones. Every stem combination joins a yang and a yin Day Master, while every branch clash and every trine joins two branches of the same polarity. So a couple whose Day Masters combine can never have clashing Day Branches, and a couple whose Day Masters clash can never share a six harmony. Opposite polarities meet softly or not at all in the branches; same polarities are where both the trines and the clashes live.
How Sajucheop scores a match
The English match page needs only two birth dates, so it reads six characters per person and leaves out the hour. Every couple starts at 62, and the score moves like this:
| Step | Relationship | Points |
|---|---|---|
| Day Masters | Combine | +18 |
| Day Masters | One element feeds the other | +10 |
| Day Masters | Same element | +4 |
| Day Masters | One element controls the other | −6 |
| Day Masters | Clash | −12 |
| Day Branches | Six harmony, same trine, or clash | +12, +10 or −16 |
| Elements | Each element one of you lacks entirely and the other has (up to two each way, +10 in total) | +5 each |
| Yin and yang | Day Masters of opposite polarity | +4 |
The result is kept between 30 and 99 and given a label: 90 and up is "A rare, fated fit," the 80s "Deeply harmonious," the 70s "A warm, workable match," the 60s "Complementary with effort," 45 to 59 "A study in contrasts," and anything lower "A challenge — and a teacher." The page also names what each of you is to the other in the Ten Gods, which often says more than the number. Sajucheop's Korean-language match uses exactly the same formula; when birth times are entered there, it also counts the elements of the hour pillar.
A worked example
Ha-eun was born in Seoul on March 10, 1996, and Ethan on August 30, 1994. Neither knows a birth time, which is fine for this page. Their six characters:
- Ha-eun: year 丙子, month 辛卯, day 丙午. Day Master Yang Fire (丙). Elements: Fire 3, Wood 1, Metal 1, Water 1, Earth 0.
- Ethan: year 甲戌, month 壬申, day 戊子. Day Master Yang Earth (戊). Elements: Earth 2, Water 2, Wood 1, Metal 1, Fire 0.
| Step | What we see | Score |
|---|---|---|
| Start | Every couple begins here | 62 |
| Day Masters | Her Fire feeds his Earth | +10 |
| Day Branches | 午 (Horse) and 子 (Rat) clash | −16 |
| Elements | He brings the Earth she lacks; she brings the Fire he lacks | +10 |
| Yin and yang | Both Day Masters are yang | 0 |
| Total | "Complementary with effort" | 66 |
Read the lines, not just the total. To Ha-eun, Ethan is the Eating God, which the match page calls "the Feast": around him, appetite and laughter come back. To Ethan, Ha-eun is the Indirect Resource, "the Oracle": conversations with her go places no one else takes him. The Day Branch clash is the practical warning. Their daily rhythms, from bedtimes to how tidy a home should be, will rub, and agreeing on those house rules early turns a clash into a division of labor.
Notice what the animal signs would have said. Ha-eun is a Rat and Ethan a Dog, a pair that scores a middling 54 on our zodiac compatibility chart and reveals nothing about the Day Branch clash or the elements they trade. That gap is exactly why Korean readers start from the Day Pillars.
How to read a "bad" result
Low scores come from a small number of structures. Take two Day Pillars that clash on both levels: Yang Wood on the Monkey (甲申) and Yang Metal on the Tiger (庚寅). The couple starts at 62, loses 12 for the stem clash and 16 for the branch clash, and lands at 34. Even if each fills an element the other lacks, the ceiling is 44, "A challenge — and a teacher." Yet the Ten Gods tell a livelier story. To the Yang Wood partner, the Yang Metal partner is Seven Killings, "the Trial": demanding, but the kind of person you grow taller around. To the Metal partner, the Wood partner is Indirect Wealth, "the Venture": plans get bigger together. That describes a stretching relationship, not a doomed one.
A healthier way to use any result:
- Treat it as a map of friction points. A clash tells you where you are likely to collide, such as pace, space or money habits. Name that area and agree on how you will handle it.
- Look at the whole chart. All eight characters, the Ten Gods between you and the element each person most needs (see the useful god) can outweigh a single clash.
- Mind the timing. Luck pillars change every ten years, so a hard stretch for one partner is not a verdict on the pair. Our guide to luck pillars explains how they shift.
- Keep animal signs in proportion. A clash or wonjin between birth years involves one character out of eight.
- Talk to family with respect. If a parent is worried, ask what the reader actually said. Usually it is one relationship in the chart, and going through the full reading together calms things more than arguing about fortune-telling.
Saju is a tradition for reflection, not a verdict. A high score does not guarantee a happy marriage, and a low one is not a reason to end a good relationship.
To try it yourself, put both birth dates into the match page, or send a link and let your partner enter their own. Compare your two Day Masters in the compatibility table, check your birth-year animals on the zodiac chart, and if you would like all eight characters first, cast your chart.
Keep reading
All articles · The ten Day Masters · 60 Day Pillars · 한국어로 읽기
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