Hunmin chong-um means exact "The right sound to teach people",
which was not only the name of new character, so called
"Hunmin chong-um", but also the name of interpretation book
into Chinese character written by the Chiphyonjon
court scholars in September of 1446.
Hunmin chong-um consists of courtesy part,
comment part and introduction part.
It includes backgrounds and the reason of creating Hangul,
numbers of alphabet, the system & principle and the usage of it.
in 1447 the courtesy part of Hunmin chong-um was translated
in Hangul. This book is also called Hummin chong-um.
So the first Hunmin chong-um is called the original book of
Hunmin chong-um and the other one is called the translated book.
Also Hunmin chong-um was acknowledged and
registered as the 'Memory of the World' of Unesco in 1997.