Day Master Saju Guide: Your Ilgan, the 'You' of the Chart

Your day master, called ilgan (일간, 日干) in Korean, is the Heavenly Stem of your birth-day pillar. In saju it represents you, and every other character in the chart is read in relation to it. Know your day master and you know the main character of your saju story; the other seven characters are the cast and the scenery around it.

There are ten possible day masters, one yang and one yin version of each of the five elements. It’s the closest thing saju has to a “sign,” but it works differently: it’s a starting point for relationships, not a label that stands alone.

Here’s how the Moon Rabbit explains it.

How to find your day master

Your day master is the top character of your day pillar. Finding it takes one lookup, not a calculation you can do in your head:

You need your birth date, and ideally your time, because a late-night birth can shift the day.
The day pillar comes from a continuous 60-day count that has rolled on, unbroken, for more than two thousand years. It ignores months and weeks, so it can’t be guessed from the date.
Look it up in a manseryeok (만세력) almanac or with a saju calculator.

About the late-night birth: the day begins with the 子 ja (Rat) hour at 23:00, and some Korean schools split that hour into yajasi (야자시, before midnight) and jojasi (조자시, after midnight). If you were born between 23:00 and 01:00, your day master may depend on which rule your calculator uses, so it’s worth checking the settings.

The ten day masters in one line each

Each day master pairs an element with a polarity. Here’s a quick character sketch, with SajuBunny’s matching rice cake:

Day master	In one line	Tteok
甲 gap, yang wood	the upright tree: principled, forward-growing	garaetteok
乙 eul, yin wood	the climbing vine: adaptable, well-connected	songpyeon
丙 byeong, yang fire	the sun: open-hearted, radiant, generous	mujigae-tteok
丁 jeong, yin fire	the lamp: focused warmth, quiet devotion	kkultteok
戊 mu, yang earth	the mountain: steady, protective, unhurried	sirutteok
己 gi, yin earth	the field: nurturing, practical, receptive	baekseolgi
庚 gyeong, yang metal	the axe: decisive, loyal, straightforward	jeolpyeon
辛 sin, yin metal	the jewel: precise, refined, discerning	gyeongdan
壬 im, yang water	the river: curious, restless, far-sighted	yakbap
癸 gye, yin water	the rain: intuitive, gentle, quietly nourishing	injeolmi

These sketches are traditional imagery, not boxes. A 丙 sun born in a winter month, surrounded by water, is read very differently from a 丙 sun born at the height of summer. That’s the next step.

Strong or weak: how the chart supports you

Once the day master is known, practitioners ask how much support it gets from the other seven characters. They look at three things:

Season. Is the day master born in a month that feeds it? Wood thrives in spring, fire in summer, metal in autumn, water in winter, and earth in the transitions between seasons. This is the heaviest factor for many readers.
Roots. Do the branches under the pillars contain the day master’s element, or the element that produces it?
Company. How many stems share or feed the day master’s element, and how many drain or restrain it?

A chart with lots of support is called strong (신강 singang, 身强); one with little is called weak (신약 sinyak, 身弱). Neither is better. Practitioners describe strong day masters as self-driven and happiest with outlets for their energy, and weak day masters as collaborative and happiest with allies around them. The element that best balances the chart is called the yongsin (용신, 用神), the “useful god.” Different schools calculate it differently, which is why two readers may disagree here more than anywhere else.

The ten gods: how everything relates to you

The day master turns the chart into a web of relationships. Every other character gets a label, a sipseong (십성, 十星), based on two questions: what does its element do to the day master’s element, and does it share the same polarity?

Relationship to day master	Same polarity	Opposite polarity
Same element	비견 bigyeon, Peer	겁재 geopjae, Rival
Element I produce	식신 siksin, Creator	상관 sanggwan, Rebel/Performer
Element I control	편재 pyeonjae, Adventurer wealth	정재 jeongjae, Steady wealth
Element that controls me	편관 pyeongwan, Challenger	정관 jeonggwan, Guardian/Order
Element that produces me	편인 pyeonin, Unconventional mentor	정인 jeongin, Nurturing mentor

Here’s an example. Say your day master is 丁 jeong, yin fire.

丙 byeong, yang fire, is the same element with opposite polarity: Rival, a lively competitor-companion energy.
甲 gap, yang wood, produces fire with opposite polarity: Nurturing mentor, symbolizing support and learning.
庚 gyeong, yang metal, is controlled by fire, opposite polarity: Steady wealth, traditionally linked with reliable effort and practical resources.

In saju symbolism, the ten gods describe roles and energies in your life: how you express yourself, what you pursue, what pushes you and what supports you. The “wealth” labels are symbolic, about how you relate to effort and resources, not a forecast about money.

Living with your day master

A few friendly tips for using your day master well:

Read it as a starting point. It’s your main theme, not your whole chart. Two people with the same day master can have very different charts.
Notice the season. Your month branch often explains why your day master feels bolder or softer than the textbook description.
Use it as a vocabulary. “I’m a 己 field day master, so I recharge by tending things slowly” is a fun, useful way to talk about yourself with friends.
Hold it lightly. Practitioners say the chart describes tendencies. You decide what to do with them.

FAQ

What is a day master in saju?

The day master, or ilgan (일간), is the Heavenly Stem of your birth-day pillar. Saju treats it as the symbol of you, and it’s the reference point for reading every other character in the chart. There are ten day masters, a yang and a yin form of wood, fire, earth, metal and water, each linked to a traditional nature image such as a tree, the sun or rain.

How do I know my day master?

Look up the pillar for your birth date in a manseryeok almanac or use a saju calculator; the top character is your day master. It can’t be worked out from the date alone, because days follow a continuous 60-day cycle. If you were born between 23:00 and 01:00, check how the calculator handles the Rat hour, since that can change the day.

What does a strong or weak day master mean?

It describes how much support your day master gets from the rest of the chart, mainly the birth season, the branches and the neighbouring stems. Strong charts are traditionally read as self-driven and in need of outlets; weak charts as collaborative and energized by allies. Neither is better. Readers use this to find the balancing element, the yongsin, which schools calculate differently.

Is the day master more important than my zodiac animal?

In saju, yes. Your zodiac animal usually comes from your birth-year branch, which is traditionally read for background and your social world. The day master comes from your birth day and is read as your core self. That’s why Korean saju fans are more likely to ask “what’s your ilgan?” than “what’s your ddi?” when they want to know what someone is like.

Try it with the Moon Rabbit

Find your day master and its rice cake with the Moon Rabbit’s What tteok are you? quiz. Want the whole cast of eight characters? Get your free saju card.

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.