A linguistic fossil
On Jeju Island, asking for "water" by its Standard Korean name, "mul" (물), might get you a blank stare from an older resident. They would call it "meureu" (므르). This is a difference in accent; it shows the past. The speech of Jeju, known as Jejueo, is considered by many linguists to be a distinct language, not merely a dialect of Korean. Its vocabulary, grammar, and pronunciation are so different that it is not mutually intelligible with mainland Korean.
The island's geographic isolation allowed Jejueo to develop on a separate trajectory from the 15th century. It retains a trove of features from Middle Korean, the language of the early Joseon Dynasty, which have long since vanished from the peninsula. This makes Jejueo a kind of linguistic time capsule. For researchers, studying Jejueo is like performing archaeology on a living language, uncovering the structure and sounds of Korean as it was spoken over 500 years ago. One of the most significant of these preserved features is the vowel arae-a (ㆍ). This sound, which no longer exists in Standard Korean, is an important reason why Jejueo sounds so distinct and is a pillar in the argument for its status as a separate language.
On the brink of silence
In 2010, UNESCO classified Jejueo as "critically endangered," its highest level of endangerment. At that time, estimates suggested between 5,000 and 10,000 fluent speakers remained, nearly all of them born before 1950. More recent estimates suggest the number of truly fluent speakers may now be far less than 1,000. The language was severely undermined following the Jeju Uprising of 1948 and the subsequent Korean War, which led to widespread suppression and displacement. Modernization and the mandated use of Standard Korean in schools and public life have left Jejueo largely confined to the homes of the elderly and a few local markets.
Despite the grim outlook, revitalization efforts are underway. The Jeju Language Preservation Society, founded in 2008, publishes magazines and holds classes. Local universities offer free language programs for adults, and there are classes specifically for marriage-based immigrants. Digital tools, such as the Jejueo Talking Dictionary, are being developed to document the language with audio and video recordings of native speakers. These efforts aim to ensure that this unique linguistic heritage does not disappear completely, preserving the culture and identity of Jeju Island.