What is a yongsin?
A yongsin (용신) is the single element a chart most needs. I read the eight characters of a saju (사주), the Korean reading of the four pillars of birth, work out what is overflowing and what is running thin, and then choose the one element that would bring the whole arrangement closer to balance. That choice is not decoration. It becomes the thread the rest of the reading hangs on, because once you know what a chart is short of, you know which of its habits are useful and which cost it something.
The rest of this page is the working behind that sentence: what the five elements do, why counting them is not enough, why the month of birth can overturn the count, and why two honest readers can land on two different answers. If the four pillars are new to you, what saju is is the shorter place to begin.
What are the five elements in saju?
The five elements, ohaeng (오행), are the world's energy divided five ways: wood, fire, earth, metal and water. They are not five substances. They are five things that energy does, and each one has a stretch of the body traditionally read with it.
| Element | What it does | Read in the body as |
|---|---|---|
| Wood (목, 木) | Extends, pushes outward, grows into space | Eyes, muscles, tendons |
| Fire (화, 火) | Spreads and lights up | Heart, blood vessels |
| Earth (토, 土) | Holds, stores, passes things between | Digestion, immunity |
| Metal (금, 金) | Gathers in, trims, finishes | Breathing, skin |
| Water (수, 水) | Flows and moistens | Bones, ears |
Read the middle column alone and you already have a rough sense of a person. A chart weighted towards wood pushes outward and wants somewhere to grow into. A chart weighted towards metal cuts, finishes, and dislikes loose ends. Neither is better. Each has a cost when there is too much of it and a different cost when there is too little, which is why a yongsin has to be chosen rather than looked up.
How do the five elements feed and check each other?
The five are not a list. They are a circle, and the circle runs in two directions at once.
In the feeding direction, water grows wood, wood lights fire, fire makes earth, earth holds metal, and metal makes water again. In the checking direction, each element presses on the one two steps ahead of it: wood breaks earth, earth dams water, water puts out fire, fire melts metal, and metal cuts wood. Being fed is not automatically kind and being checked is not automatically cruel. A fire fed by an enormous quantity of wood is buried rather than helped, and a wood with no metal near it grows in every direction and finishes nothing.
So the question is never simply how much of each element a person has. It is what each one is doing to its neighbours.
Why is counting the characters not the whole picture?
Most free apps give you a tidy count: three wood, two fire, no metal. That count is real, and it is the least informative thing on the screen. Three reasons.
- Position carries weight. A character sitting in the month branch, which sets the season of birth, counts for far more than the same character sitting out on the year stem. Two people can have identical totals and completely different balances.
- The count only means something relative to the day master (일간), the stem of the day you were born, which stands for you. Metal is a burden to one day master and a lifeline to another. Missing metal is not one condition, it is ten different conditions depending on whose chart it is missing from.
- An element can be present on paper and useless in practice, sat where nothing can reach it, or present in the hidden characters of a branch rather than on the surface.
Out of that reading comes the first real judgement: whether the chart is sin-gang (신강), meaning the forces supporting the day master are ample and there is strength to spare, or sin-yak (신약), meaning that support is thin and ordinary loads feel heavy. Neither is good news or bad news. A strong chart has surplus and needs somewhere to spend it. A weak chart has little and needs somewhere to be filled. The direction differs, that is all. Reading the chart layout goes through where each of these characters sits.
The same applies to the phrase people arrive with most often, that they have too much fire. Too much fire is not a fault. It is a large amount of one kind of movement that has to go somewhere, and the useful question is where.
Why does the season of birth change everything?
Because temperature comes before arithmetic. Someone born in the depth of winter with not one fire character has to be thawed before anything else is discussed, whatever the counts say. Someone born at the height of summer with fire piled on fire has to be cooled first. That branch of the work is johu (조후), choosing by climate, and when the climate is extreme it takes priority over every other consideration.
The part most often missed is that hot and cold is one axis and dry and damp is another. They are not the same measurement. A chart born in spring with no water anywhere is not hot, but it is dry, and dryness needs moisture rather than cooling. Get those two confused and the prescription comes out backwards. I check the two separately before choosing anything.
How is a yongsin chosen, and why do two readers disagree?
There are two main ways in, and they are not always going to agree.
Eokbu (억부) works by surplus and shortage: drain what overflows, fill what is short. If the day master has strength to spare, the chosen element is the one that gives that strength an outlet. If the day master is thin, the chosen element is the one that feeds it. Johu (조후) works by climate first, as above, and will override the arithmetic when a chart is frozen or scorched.
A chart where both methods point the same way is straightforward. A chart where they point different ways is where practitioners split, and that split is honest rather than careless. One reader weighs the climate as decisive, another weighs the balance of support as decisive, and each can give you their reasoning. It is one reason the same eight characters come back with different answers from different desks, and why saju readings differ sets out the rest. What I would say is that a yongsin offered without the reasoning attached is not worth much. You should be able to see why that element and not another.
What if my yongsin is not in my chart at all?
It happens, and it is not rare. Some people have nothing at all on the surface of the element they most need, and the first reaction is usually to assume the chart is broken. It is not.
The element may be sitting inside the earth branches, held in the hidden characters that do not show in a simple display but are perfectly real in the reading. And whether or not it is hidden there, it arrives from outside on a schedule: the ten year cycles and the yearly cycle bring elements in and take them away again for the whole of a life. A chart that never held the thing it needed can be standing in a decade that supplies it.
Does wearing my yongsin colour change my luck?
You will hear it constantly. Your yongsin is wood, so wear green and face east. I am not going to tell you flatly that it does nothing, because I have no grounds for saying that either. What I will not say is that the flow of a life turns on a jumper. Not asserting things I cannot support is a rule I keep here, and it costs me a few easy sentences.
What I do instead is translate the direction a yongsin points into ordinary choices. What grain of work suits this chart and what grain grinds against it. What is worth doing first and what is better left until later. Which years that element comes in, written out with the year and the age beside it, so you see them coming rather than hearing about them afterwards. That is the part you can put your hand on, and it fills most of the report. The sample pages show how it looks written down.
What this page cannot tell you about your own chart
Everything here is general explanation. It will let you follow a conversation about the five elements and tell a careful yongsin from a careless one, but it cannot tell you what yours is. That answer depends on the whole chart: the day master, the month of birth, what sits next to what, what is hidden in the branches, and which decade you are standing in now. Anyone naming your yongsin from a single fact about you is guessing.
What a reading gives you is tendency and timing, never a fixed outcome. Each chart becomes one landscape, which is slow and the only way I know to keep the whole thing in view at once. The reports are written in Korean at present. An English edition is in preparation, with a waitlist.
The calendar conversion, the stems and branches, the cycle start age: all of that is arithmetic and I let a computer do it. The judgement of what a chart needs is the part that takes the time.