Celestial Hangul Sequence
Capturing Every Sound
Reviving the scientific principles of Hunminjeongeum, created by King Sejong the Great
Over 40 Years of Hunminjeongeum Research
Dr. Ban Jaewon
Director, Hunminjeongeum Research Institute
A scholar who proved that King Sejong's original 28 letters can transcribe every sound of every language — by restoring the four lost letters and revealing their scientific principles.
28
28 Letters
28
28 Mansions
40+
Years of Research
Testimonial
I express my deep respect for your devoted efforts to elucidate the creation principles of Hunminjeongeum and promote the international use of Hangul.“
Ban Ki-moon
8th Secretary-General of the United Nations
February 19, 2008
The Celestial Map & Hunminjeongeum
28 Mansions in the Sky, 28 Letters of Sound
The 28 letters of Hunminjeongeum correspond precisely to the 28 lunar mansions of the celestial map. The constellations of heaven are the system of sound — this is the cosmic principle King Sejong designed.
Revival of the Lost Four Letters
Arae-a · Deep Sound (ㆍ)
The fundamental vowel symbolizing 'Earth' in the heaven-earth-human triad. Lost from modern Korean, yet essential for the complete Jeongeum system.
Ban-siot · Yeorin-siot (△)
A consonant representing semi-dental sounds. Essential for naturally transcribing foreign phonemes like English /z/.
Yeorin-hieut (ㆆ)
A consonant representing the glottal stop. Essential for transcribing phonemes in Arabic, Hebrew, and other languages.
Yet-ieung · Yeorin-gieuk (ㆁ)
Independent initial consonant for the velar nasal /ŋ/. Used for English 'sing' and Chinese initial consonants.
Research Milestones
1983
The Origin of Hunminjeongeum Published
Co-authored by Ban Jaewon & Yun Deok-jung, Gukmunsa. First publication on Hunminjeongeum creation principles
2007
Yanji International Conference
Unanimous resolution for Jeongeum 4-letter keyboard insertion
2007–08
Endorsements & Testimonials
Endorsements from NIKL Director Lee Sang-gyu, Prof. Jin Yong-ok, and UN Secretary-General Ban Ki-moon
2018
Hunminjeongeum Creation Principles and Functional Hangul
14th edition completed. Culmination of over 40 years of research
2025
Digital Research Implementation
Digital implementation research based on Hunminjeongeum principles begins
The Future of Hunminjeongeum
Learn more about Dr. Ban Jaewon's 40+ years of research and archive materials.