Mutal Unnie › Practical Saju guides

What Is Nayin (Napeum Ohaeng)?
— Gold in the Sea, Roadside Earth and all 30 pairs in one table

2026-10-30 · Mutal Unnie editorial team

What is Nayin (napeum ohaeng), and how is it different from the regular Five Elements?

Nayin, napeum ohaeng (納音五行) in Korean, doesn't read the Heavenly Stem and Earthly Branch one character at a time; it pairs the sixty stem-branch combinations two by two and gives each pair a single element and a picture-like name. Take Gapja (甲子): as characters, Gap is Wood and Ja is Water. In Nayin, though, Gapja and Eulchuk (乙丑) form one pair called Gold in the Sea (海中金), metal sunk beneath the waves.

The elements you count when someone says “you have three Metal” are the regular Five Elements, called jeong-ohaeng (正五行), fixed for each character. Nayin is a separate layer that runs alongside them, so it's perfectly normal for the same pillar to have one element by its characters and another by its Nayin. Counted across all thirty pairs, Wood, Fire, Earth, Metal and Water get exactly six pairs each.

Napeum (納音) means “receiving the sound.” Tradition says it comes from matching the old music theory of the five notes (五音) and the twelve pitch pipes (律呂) to the sixty pairs, but sources explain the actual calculation differently. Rather than settle the origin story, this article focuses on reading today's table accurately. English-language BaZi books usually use the Mandarin reading, Nayin, which is the name used across this site.

Where can I find my Nayin in the full table of all 30 pairs?

Look up the stem-branch pair of your birth year (year pillar) or birth day (day pillar) in a manseryeok, then find the row that contains it below. Your eight characters are one step away in the free manseryeok calculator.

1. Get your pairDecide whether you're looking up the year pillar or the day pillar, then write down that pillar's two characters.
2. Find the rowFind your pair in the first column. The two pairs in one row share the same Nayin.
3. Check IpchunThe year column treats each year as running from Ipchun (立春, Start of Spring, around February 4) to the next Ipchun. If you were born in January or early February, you may belong to the previous year's row.

The years start from 1924 as a Gapja year and repeat every 60 years. The first pair in a row is the earlier year, the second the later one; 1990 (Gyeong-o) and 1991 (Sinmi), for example, are both Roadside Earth. Roadside Earth is written both 路傍土 and 路旁土 with the same meaning. If you were born outside Korea in early February, compare your birth moment with Ipchun in Korea time; Ipchun 2027, for example, is at 10:46 KST on February 4.

What's the difference between my year Nayin and my day Nayin?

When people say something like “a 1984 Gold in the Sea Rat,” pairing Nayin with a zodiac animal, they mean the year pillar's Nayin; the day pillar's Nayin comes from your birth day, so the same person usually has two different ones. A Saju chart has four pillars, so strictly speaking everyone has four Nayin.

Take someone born at 14:30 on May 15, 1990 (entered as Korea time). Their chart is a Gyeong-o year, Sinsa month, Gyeongjin day and Gyemi hour. Here's the Nayin for each pillar, calculated by the Mutal Unnie engine.

The year Nayin is shared by everyone born between the same two Ipchun moments. It was central to older methods that read a chart mainly from the birth year, and today you mostly hear it as conversation alongside the zodiac animal. The day Nayin comes from a day pair that returns every 60 days, so it's read as a picture closer to you personally. For the person above, the picture of the year is Roadside Earth (Gyeong-o) and their own picture is White Wax Metal (Gyeongjin).

Why are 2026 and 2027 both Water of the Milky Way?

Because 2026, Byeong-o (丙午), and 2027, Jeongmi (丁未), are one Nayin pair. The sixty pairs share their Nayin two at a time, so the year Nayin changes every two years. This pair's Nayin is Water of the Milky Way (天河水), literally “river of heaven.”

Here's the interesting part. By character, Byeong, O and Jeong are all Fire, which is why the two years are called the year of the Red Horse and the year of the Red Sheep. By the regular elements, they're two very fiery years, yet their Nayin carries a Water name. Traditional readings explain Water of the Milky Way not as water rising from the ground but as rain and dew falling from the sky, water that soaks everything evenly from above.

The Saju year changes at Ipchun. By the Mutal Unnie engine, the Jeongmi year begins at 10:46 KST on February 4, 2027 (01:46 UTC on the same day); anyone born before that moment is a Byeong-o baby. From 2028, the Musin (戊申) year, the year Nayin moves on to Great Post-Road Earth (大驛土). The Jeongmi year is covered in What zodiac year is 2027?, and both day pillars of this pair have their own pages: Byeong-o and Jeongmi.

How do I read Nayin names like Gold in the Sea or Roadside Earth?

Read each Nayin name as a metaphor that shows what state an element is in. Metal sunk in the sea (Gold in the Sea), metal honed to a blade's edge (Sword-Edge Metal) and metal beaten into thin leaf (Gold Leaf Metal) are all Metal, but tradition sees their use and mood as different.

These pictures aren't formulas for your personality, though. Don't take Gold in the Sea as “you'll bloom late” or Roadside Earth as “you'll have a hard life.” The Nayin picture for each of the 60 day pillars is in All 60 Day Pillars, and the first pair, Gold in the Sea, is unpacked in detail on the Gapja day pillar page.

How does Nayin compatibility work, and how far can I trust it?

Nayin compatibility compares two people's year (sometimes day) Nayin elements through the generating and controlling cycles; because everyone born in the same year gets the same result, it's best kept as a reference. Gold in the Sea (Metal) and Long-Flowing Water (Water), for instance, are read as generating, since Metal gives rise to Water, while Roadside Earth (Earth) and Great Sea Water (Water) are read as controlling, since Earth dams Water.

Some books also make exceptions based on the picture: certain Nayin are said to become useful only when they're controlled, so the same combination can get a different verdict from book to book. And since year Nayin changes only every two years, it can't capture two people's actual personalities or ways of living.

How much weight does Nayin carry in modern Saju readings?

In the Ziping (子平) style of reading that's most common today, element counts, Day Master strength and the Useful God are all calculated with the regular elements, and Nayin is usually a supporting layer that adds imagery and mood. So a Metal Nayin doesn't add one more Metal to your chart's count.

The thirty pairs and their names are shared with Chinese BaZi (八字) and Japanese Shichū Suimei (四柱推命). How much weight they get varies by school and by reader: some open a reading with the year Nayin, others barely mention it. How the terms differ by country is compared in Korean Saju vs. Chinese BaZi vs. Japanese Shichū Suimei.

How can I find my Nayin on Mutal Unnie?

Check your year and day pillars with the free manseryeok calculator on the web, then find them in the table above; you'll have your Nayin in a minute, no sign-up needed. Each of the 60 day pillar pages also lists its Nayin together with its Gongmang and day-branch Ten God.

In the app, your chart is calculated from your date and time of birth, and the one-line rhythm for the day and adding events are free. The app uses the clock time you enter as Korea time (KST), so if you want to see how old standard times or daylight saving time change things, compare them first with the correction options in the web calculator.

Start with today's rhythm

Available on iPhone and Android. Daily rhythm cards and adding events are free. Check the cost before opening a paid reading. Store availability and app language support depend on the listing.