Every day has a name
In the Korean system each calendar day carries one of sixty names, made by pairing ten heavenly stems with twelve earthly branches. The pairing runs in step, so the cycle closes after sixty and starts again. Today is one of those sixty; so was the day you were born. The name is called iljin (日辰), and it is the fixed half of any Korean daily reading.
This counting does not restart at midnight on January 1, or at Lunar New Year, or at anything else you can see. It has simply been running, one day at a time, for as long as the calendar has been kept. Two people born sixty days apart share a day name; two people born fifty-nine days apart do not.
The other half is you
A Western daily horoscope sorts everyone into twelve piles and writes twelve paragraphs. Korean daily readings do not work that way. The reading comes from two day names meeting — the one today carries and the one you were born under — and what matters is the relationship between them. Same element, opposing element, one feeding the other. Those relations have names and fixed meanings, which is why a Korean reading can tell you why it says what it says.
The practical consequence is that a Tuesday which is quietly productive for one person is a day of friction for another, and the system can say which and why. It also means there is no honest way to write one paragraph that covers everybody, and any daily fortune that does is working from the calendar alone.
What a day reading can and cannot say
It can say what kind of day this is for you — where things will move easily, where they will catch, what is worth putting off until the pressure drops. It cannot say what will happen. Nothing in the four pillars claims to; the frame is about tendency and timing, not events.
Readings on this site are written in advance and looked up, never generated on the spot, so the same birth date on the same date always gets the same words. That is deliberate. A daily fortune that reads differently each time you open it is telling you about its own randomness.
The colour, direction and number
Korean daily readings often end with three small things to carry: a colour, a compass direction, and a number. These are not decoration and not arbitrary. The colour comes from the element of today's heavenly stem, the direction from where that element sits on the compass, and the number from the branch's position in the cycle of twelve. They change every day because the day name changes every day, and each of them can be traced back to the character it came from.
Reading yours
The daily reading itself is written in Korean. It takes a birth date, works out both day names, and reads the relation between them — the date stays in your browser and is not put into the address.