When someone says "I am Fire" or "I am Water" in saju, they are naming one thing: their Day Master (일간, Ilgan). It is the single character that represents you in your Korean four pillars chart, and everything else in the chart is read in relation to it. This guide explains what the Day Master is, what each of the ten Day Masters traditionally means, and how to find yours free, in plain English.
Your saju — the four pillars of destiny — is built from your birth year, month, day and hour. Each pillar has a top character (a Heavenly Stem) and a bottom character (an Earthly Branch), giving eight characters in total. Of those eight, one is treated as you: the Heavenly Stem of the Day Pillar, your Day Master.
Everything a reading says about support, drain, balance and timing is measured against this one character. That is why finding your Day Master is the first practical step in understanding any saju chart.
There are ten Day Masters — the Five Elements, each in a yang (outward, active) and a yin (inward, refined) form. Each is traditionally described with a piece of imagery that hints at its temperament.
| Day Master | Image | Temperament often described |
|---|---|---|
| Yang Wood (甲) | Tall tree | Upright, growth-minded, principled, slow but steady to bend |
| Yin Wood (乙) | Vine, grass | Flexible, adaptive, resilient, finds a way around obstacles |
| Yang Fire (丙) | Sun | Bright, warm, visible, generous, leads with energy |
| Yin Fire (丁) | Candle, lamp | Focused, attentive, warm in close circles, detail-aware |
| Yang Earth (戊) | Mountain | Stable, dependable, broad, slow to move, hard to shake |
| Yin Earth (己) | Field, garden soil | Nurturing, practical, supportive, quietly productive |
| Yang Metal (庚) | Axe, raw ore | Decisive, direct, strong-willed, cuts to the point |
| Yin Metal (辛) | Jewelry, fine blade | Refined, precise, values quality, sensitive to detail |
| Yang Water (壬) | Ocean, river | Expansive, resourceful, mobile, big-picture thinker |
| Yin Water (癸) | Rain, dew, mist | Gentle, intuitive, adaptable, quietly persistent |
These images are traditional shorthand, not labels that define you. They are meant to make an abstract element feel concrete so you can reflect on whether the description rings true.
A reading also asks how much support your Day Master gets from the other seven characters. This is described as a strong or weak Day Master, and it is one of the most misunderstood ideas in saju.
Once you know your Day Master, the rest of the chart reads as relationships around it. The same logic shows up across every area of a reading:
This is why a single Day Master can branch into a full reading: it is the reference point everything else is measured from.
Honesty matters. Your Day Master will not predict events, fix outcomes or replace your own judgment. Saju is a centuries-old vocabulary for describing temperament and timing, and it is best used for self-reflection and entertainment, not as a forecast. Two people with the same Day Master live very different lives because skills, choices and circumstances do most of the work. Read your Day Master as the opening line of a longer story about yourself — a starting point, not a verdict.
No. You have exactly one Day Master — the Heavenly Stem of your Day Pillar. Other element characters appear across your chart, but only that one represents you. The others are read as forces around your Day Master.
That is common and useful information. The traditional image is only the baseline. Your full chart can pull a Day Master in many directions through its element balance and the ten gods, so a Yang Fire person in a Water-heavy chart may feel very different from the "sun" stereotype. Read the whole chart, not just the label.
Not to find your Day Master. The Day Pillar is set by your date. Birth time fixes the Hour Pillar, which adds detail traditionally linked to later life and hidden themes. For more on this, see the guide to saju and birth time.
Right here. The free Cheonmyeongdang calculator turns your birth date and hour into your eight characters, clearly labels your Day Master, and summarizes your Five Elements balance in plain English.