Tojeong Bigyeol — Joseon Korea's New Year Fortune Book

Published August 21, 2026

Every Lunar New Year season, one name reliably returns to Korean news and portal sites: Tojeong Bigyeol, literally "the secret formulas of Tojeong." This fortune book, which derives a hexagram-style reading for the coming year from a person's birth date, has been one of Korea's most beloved New Year customs since the late Joseon dynasty — so ingrained that "checking one's Tojeong Bigyeol in the first month" became an idiom of its own.

Yet few people know how the book actually computes its readings, whether the famed scholar Yi Ji-ham — whose pen name Tojeong graces the title — really wrote it, or why it exploded in popularity precisely in the nineteenth century. This guide walks through the book's structure and calculation method, the authorship debate, the social backdrop of its rise, and how to enjoy it in a healthy way today.

What Is Tojeong Bigyeol?

Tojeong Bigyeol is a book of annual fortunes: it converts the year, month, and day of a person's birth into numbers, selects one hexagram-style figure (gwae) from those numbers, and offers the verses attached to that figure as the outlook for the coming year. The title honors Tojeong, the pen name of the mid-Joseon scholar Yi Ji-ham — said to derive from the earthen pavilion (to meaning earth, jeong meaning pavilion) he built and lived in by the Han River.

The structure is simple. There are 144 figures in all, and each comes with a headline verse summarizing the year's overall fortune, followed by twelve monthly readings from the first to the twelfth lunar month. The readings are written not in prose but in compact four-character lines of literary Chinese, which gives them both a poetic flavor and generous room for interpretation.

The book borrows the outward form of Yijing (I Ching) divination but simplifies it drastically. It uses its own set of 144 figures instead of the classic 64 hexagrams, and it requires no yarrow stalks or coin tosses — the birth date alone determines the figure. Anyone who knew their birthday could get a reading from a single copy of the book, and this accessibility was a key reason it spread so widely.

Who Was Yi Ji-ham? The Authorship Debate

Yi Ji-ham (1517-1578) was a scholar and celebrated eccentric of mid-Joseon Korea. Born into a distinguished family and schooled in the intellectual lineage of Seo Gyeong-deok, he shunned a conventional career, wandered the country, and argued — unusually for his time — for the importance of commerce and trade. Late in life he served as a county magistrate, where records credit him with founding a shelter to train beggars in trades, an early experiment in poverty relief.

His reputation for mastering astronomy, geography, medicine, and divination attracted legends, and Tojeong Bigyeol came to be regarded as a secret art he left behind. Modern scholarship, however, doubts that he wrote it. The book is never mentioned in his collected works, nor does it appear in the Dongguk Sesigi of 1849, a detailed record of Korea's seasonal customs — a strange silence if the book had been circulating for centuries.

The prevailing view is therefore that Tojeong Bigyeol took shape in the late nineteenth century, and that its unknown compilers borrowed the authority of Yi Ji-ham's famous name — a practice known as false attribution, common in East Asian book culture. Most surviving editions indeed date from the early twentieth century onward. Either way, the ideas in the book clearly stand on Joseon's long tradition of Yijing-based numerology.

How the Calculation Works — Three Digits from a Birth Date

A Tojeong Bigyeol figure is built from three numbers: the upper, middle, and lower digits. In the traditional method, the upper digit comes from adding one's age for that year to a number fixed by the year's place in the sexagenary cycle, then taking the remainder after dividing by eight. The middle digit comes from the birth month (with rules that add 30 or 29 depending on the month's length) divided by six, and the lower digit from the birth day divided by three.

The upper digit thus ranges from 1 to 8, the middle from 1 to 6, and the lower from 1 to 3, yielding 8 x 6 x 3 = 144 possible combinations. If the three calculations give 1, 2, and 3, the reader looks up figure "one-two-three" and reads its verses. Because the calculation uses the lunar calendar and one's age in that specific year, the same person receives a new figure each year — which is precisely what makes it a New Year custom.

Note the contrast with saju, the Four Pillars system. Saju uses all eight characters of the birth year, month, day, and hour to read a whole life; Tojeong Bigyeol drops the hour entirely and reads just one year ahead. The arithmetic is simple enough that a family needed no professional diviner — one book and one literate reader could check everyone's fortune, which earned it a reputation as the people's fortune book.

Verses and Monthly Readings — A Year Told in Metaphor

Once the figure is found, the reader first meets the headline verse for the year. Rather than declaring luck good or bad outright, the verses paint nature scenes in four-character lines: "the east wind melts the ice, and the withered tree meets spring," or "the moon is veiled by clouds — wait for the light." Auspicious figures sail with the wind or bloom in spring; cautionary ones show a dragon in shallow water or a bird caught in a net.

Below the headline verse come twelve monthly readings covering the practical concerns of daily life: this month a benefactor appears, this month guard against gossip, wealth arrives from the east. Scanning the whole year month by month at the start of January is exactly what made the book such a fitting New Year ritual — a preview of the year to plan around, shared aloud among family.

The metaphorical form has a practical wisdom of its own. Because the verses are compact and suggestive, readers naturally apply them to their own circumstances, and even ominous figures typically carry an escape clause — "with care, misfortune is avoided" — steering readers toward vigilance rather than despair. In effect, Tojeong Bigyeol functioned less as prophecy than as a new year's ritual of setting one's mind for the months ahead.

Why It Swept Late Joseon Korea

Nineteenth-century Korea, where Tojeong Bigyeol spread, was an anxious place. Court politics had decayed into rule by powerful in-law clans, famines and cholera epidemics recurred, uprisings broke out, and foreign powers pressed at the borders. In such a world, an easy-to-use book that previewed the coming year offered ordinary people a small handle on an uncertain future, and it was embraced quickly.

The era's appetite for prophetic texts — most famously the secretly copied Jeonggamnok, which foretold dynastic change — formed part of the backdrop. But unlike banned political prophecies, Tojeong Bigyeol dealt only in the homely matter of a family's year ahead, so it faced no suppression and settled comfortably into Seollal customs. Elders reading out each family member's fortune in the first days of the year became a scene repeated across Korea well into the twentieth century.

Printed editions in the twentieth century accelerated its reach further. The book survived by changing media — newspaper columns, calendar supplements, paperback fortune books — while the association "first lunar month, Tojeong Bigyeol" passed from generation to generation. A single fortune book holding the status of a national seasonal custom for over a century is a rarity anywhere in the world.

Tojeong Bigyeol Today — From Book to Screen

Today the book is encountered on screens far more often than on paper. From the PC-network fortune services of the 1990s to portal-site new year fortunes and smartphone apps, the medium has kept changing while the core experience — enter a birth date, receive a figure and its verses — remains intact. Its clear-cut arithmetic made it one of the easiest divination traditions to computerize.

The social role has hardly changed either. Comparing readings with family and friends over the holidays, laughing at the verses, and taking the occasion to sketch out plans for the year — the smartphone version continues the sarangbang scene of Joseon almost unchanged. The new year fortune on Unse Hanjan stands in this same lineage: a modern rendition of Korea's oldest new year fortune custom.

Reading It for Fun — A Healthy Distance

To be clear: there is no scientific evidence that Tojeong Bigyeol's figures predict the future. The very structure of the system — where countless people born on the same date share the same figure — shows that it is not personalized prophecy but a cultural artifact built on traditional numerology. Its verses feel apt to many situations partly because their metaphors are broad enough to invite personal interpretation.

The healthy way to read it is the way tradition always suggested: take a good verse as encouragement to start the year with energy, and a cautionary one as a nudge to double-check what matters. Avoid basing decisions about money, health, or career on any fortune reading — those call for qualified professionals. The new year fortune on Unse Hanjan is offered in exactly this spirit: entertainment and light reference, one small cup of tradition to start your year.

Frequently Asked Questions

Did Yi Ji-ham really write Tojeong Bigyeol?

Probably not, according to modern scholarship. The book appears nowhere in his collected works or in the 1849 record of Korean seasonal customs, so the prevailing view is that it took shape in the late nineteenth century and borrowed the famous scholar's pen name for authority — a common practice in East Asian book culture. Its ideas do, however, rest on Joseon's genuine Yijing-based traditions.

How many readings does Tojeong Bigyeol contain?

There are 144 figures. The birth date is converted into an upper digit (1-8), a middle digit (1-6), and a lower digit (1-3), giving 8 x 6 x 3 = 144 combinations, each with a yearly verse and twelve monthly readings. This is the book's own system, distinct from the 64 hexagrams of the Yijing.

How is Tojeong Bigyeol different from saju?

Saju reads a whole life from the eight characters of the birth year, month, day, and hour. Tojeong Bigyeol drops the hour, uses only the year, month, and day, and reads just one year ahead — with a new figure each year, since one's age enters the calculation. Its simplicity is the point: anyone with the book could check the whole family's fortunes without a professional.

When is Tojeong Bigyeol traditionally read?

Around Lunar New Year, as a seasonal custom of the first lunar month. The calculation depends only on the year and one's birth date, so the figure is the same whenever you check it during the year — but reading it as a family while making new year plans is the custom that made the book famous.

Do people born on the same date get the same reading?

Yes — the same birth date always yields the same figure, and with only 144 figures, many people share each reading. This alone shows the book is not personalized prophecy but a cultural tradition of applying compact, metaphorical verses to one's own circumstances. That interpretive act, shared across a family, was always the real heart of the custom.

What if my reading turns out badly?

No need to worry. There is no scientific evidence that the readings predict actual events, and even cautionary verses traditionally carry the reassurance that care averts misfortune. Take a bad reading as a reminder to be a little more attentive, keep important decisions with qualified professionals, and enjoy the new year fortune as it was always meant to be — for fun.

This content is for entertainment purposes only. For important decisions, consult a professional.

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