The one line
Gyeong (庚), yang metal, cuts straight through and does not work round the edges of a problem. In saju (사주), the Korean reading of the four pillars of birth, the day master is the character that stands in your place in the chart, and this one stands for the decision that has already been taken while the rest of the room is still weighing it up.
Where the character comes from
庚 carries the sense of altering, of changing a thing over into something else, and it sits close to 更, to renew or to replace. The season held inside the character is the turn at the end of summer, when growing stops adding and the work of the year becomes gathering in. Autumn arrives cool, and here the cooling is not a loss. It is the point where increase is traded for substance.
The objects the tradition hangs on 庚 all have weight to them. Raw ore. Cast iron. A large rock. An axe. A big blade. A bell. Notice what most of that list has in common. Ore is metal before anybody has touched it, and a rock is simply a rock. The axe and the big blade are not ends in themselves either, they are made to be swung at something that is not them. Only the bell has arrived anywhere, and a bell earns its keep by carrying a long way rather than by being fine. Hold the rock and the axe together and you have the character in one glance: heavy material, and a tool that has not yet been told what it is for. When we paint a chart as a single landscape, a Gyeong day master tends to show up as the mass in the scene, the thing the weather has to arrange itself around.
What it looks like in a person
The essence given for 庚 is decision. It moves in one go, with force. And its own shape has not been settled yet.
The grain of it, the way it runs when nothing is pressing on it, is to sort right from wrong and then act on the sorting straight away. Everyday version: the meeting has circled the same point for forty minutes, one person says which option they are taking and what it costs, and the meeting is over. The friend who gives you the plain account after four others gave you the comfortable one is often working from this stem.
The words set beside 庚 are justice, decision, the straight line, breaking through, and discipline. Justice here has little to do with courtrooms. It is the discomfort this person feels when a rule is applied to one colleague and quietly waived for another, and that discomfort gets voiced rather than swallowed. Breaking through is the appetite for the blocked task everybody else filed under impossible. Discipline is the quiet one: keeping to the rule when nobody is checking.
Then the third statement, the one that is easy to skim past. Its shape has not been settled. Ore is worth something long before it is a blade, but it is not a blade yet. In practice this often reads as a person whose ability was never in question while the direction took years to arrive, and it tends to arrive through something demanding rather than something pleasant. A hard employer, a long apprenticeship, a stretch of work that asked more than was comfortable and left a skill behind. That is not a late start to apologise for. It is how unworked metal becomes a particular tool instead of a general strength.
The same element, the other half
Every one of the five elements comes in two halves, and for metal they are Gyeong and Sin (辛), the character for yin metal. One question separates them: has it been worked yet. Gyeong is metal still in the rough, Sin is metal already finished, and nearly everything else follows from that single difference.
| Where they differ | Gyeong (庚), yang metal | Sin (辛), yin metal |
|---|---|---|
| Essence | The force that gathers in. Decision | Precision. Something already finished |
| Scale | Large. Rough | Small. Smooth |
| Way of working | Force, in one go | Skill, over many passes |
| What sets the value | Weight and hardness | Precision and lustre |
The row worth sitting with is the last one. Value is not measured the same way in the two columns, so the halves cannot be ranked against each other. Ask a Gyeong to compete on fineness and you have set a rock against a needle at needlework. Ask it to hold under load and the comparison reverses. The companion page for Sin (辛), the yin metal day master works through the same table from the other column.
The season changes everything
Most English writing about the four pillars names the stem and stops, leaving out the half of the reading that does the most work. The stem tells you the material. The month tells you what state that material is in, and for metal that matters more than for most, because metal answers to heat and cold in ways you can see.
| Season | The image of Gyeong |
|---|---|
| Autumn | Its own season |
| Summer | Metal in the heat of the fire |
| Winter | A frozen rock |
That line changes what advice even means for this stem. With some day masters you can say something useful about the character on its own. With Gyeong you mostly cannot. Autumn is its own season, and a stem in its own season has no shortage of raw force, which is the starting condition rather than the good outcome: plenty of material, no shape agreed. Summer puts the metal in the fire, uncomfortable in the living of it and also how anything gets forged, so a summer Gyeong is often someone put under pressure early who came out with a definite form. Winter freezes the rock. The hardness is still there, but the cold has to come off before the material will move, so in a cold stretch this stem needs warmth from somewhere rather than another demand for force.
Two people can share this day master and need opposite things from the same year. That is ordinary, and it is why the month is read before anything is decided.
What happens when it meets other characters
Gyeong and Jeong (丁), yin fire. This is the meeting the tradition rates highest for 庚. Fire heats metal, and heated metal can be made into a vessel, so rough material turns into something with a use and a name. Jeong is the contained fire of a lamp or a forge rather than a blaze, and the containment is the point: steady heat shapes, while a sudden one only scorches. In a life this tends to be the teacher, the trade or the demanding work that gave a general capability a particular form.
Gyeong and Gap (甲), yang wood. Metal cuts wood, which reads as damage until you look at what is being cut and when. Gap is the great tree, and meeting an autumn Gap turns the axe into a builder rather than a wrecker, because what comes out is a roof beam. Breaking a growing thing and shaping seasoned timber are the same motion with opposite results. Where this appears, the useful question is whether the thing being cut into has finished growing.
Gyeong and water. Metal produces water in the cycle of the five elements, and that gives this stem its outlet. When there is more force in a chart than there is work to spend it on, water is where the surplus goes. A strong Gyeong with nowhere to put it tends to cut where no cutting is needed, simply because the edge is there. Water turns that into expression: writing, teaching, speaking, anything carrying the force outward in a form others can use.
The other side of the same strength
The price of Gyeong is in the finish. Rough is the honest word the tradition uses, and flexibility is short. An edge that goes through cleanly goes through whether or not the moment was right, and the version of a sentence that is true is not always the version that is bearable to hear. There is a second part to the cost: after the cut is made, the feeling stays. The stem everybody reads as hard is often the one still turning a decision over weeks later, having shown nobody.
None of that is a flaw and none of it needs correcting. It is the bill attached to being able to end things other people cannot end. What helps is practical. Sort in advance which matters are worth an edge and which are only preferences wearing a principle's coat. Leave a night between deciding and saying, which costs almost nothing and changes the delivery entirely. Say plainly that the cut was about the matter and not the person, which is obvious to you and invisible from outside. And take the feeling that lingers as evidence of care rather than a weakness to be trained out.
One letter out of eight
The day master is one character out of eight, and the other seven decide how it sounds. Gyeong with fire nearby reads as metal on its way to becoming a tool. With water nearby it reads as force with somewhere to go. Alone in a cold chart it reads as strength waiting for conditions. The month, the hour, the ten year cycles and the yearly cycle all move the picture, far enough that two people who share this stem may recognise little of each other in one description.
So take this page as the opening note rather than the finding. It gives you the material and the questions worth asking about it, and stops there on purpose. If the four pillars are new to you, begin with what saju actually is, then look at a full reading to see how eight characters are read together and painted as one scene.