All transcriptions of Korean involve digraphs of one kind or another and use separators to distinguish a string of two letters in their separate values from their single value as a digraph.
Many of these letters ended up only accustomed to depict the Seems of Chinese rime tables. Many of the Korean Seems represented by these out of date letters even now exist in dialects.
A however before method of the language, sometimes known as Previous 분양 Korean, is inferred from area-names and through the twenty five poems (identified as hyangga