This is not a claim. This is data.
Hangeul is not a script passed down through myth. Its creator, the year of creation, the design principles, and the annotated manual — all exist as documented records.
History testifies to itself.
Veritable Records of the Joseon Dynasty, Year 25 of King Sejong (1443), 12th month:
"This month, His Majesty personally created twenty-eight letters of Eonmun… and named them Hunminjeongeum."
In the history of the world's writing systems, Hangeul is the only script for which the creator, the date of creation, and the design principles are all simultaneously documented in historical record.
Hangeul Day (October 9) has been designated as a national commemoration since 1946, calculated from the promulgation date converted to the solar calendar.
From the preface to Hunminjeongeum, written by King Sejong himself:
"The language of our nation differs from that of China, and the written characters do not correspond to our spoken words. Therefore, among the ignorant people, many who have something to say are unable to express their thoughts. Feeling compassion for them, I have newly created twenty-eight letters…"
To dismantle the monopoly of knowledge. To allow every person to express their thoughts. This was the design intent — and the creator himself put it in writing.
When scholars submitted a memorial opposing the creation in 1444, King Sejong rejected it and saw the project through.