is an archaic Writing System which represents the Korean Language using Hanja . It was used from Silla to Joseon periods. The system was regularized by Seol Chong . The '' Hyangga '', colloquial poems of the Silla period, were often written using idu.
The idu script used Chinese Characters , called Hanja , as a base, along with special symbols to indicate Korean verb endings and other grammatical markers that were different in Korean from Chinese. This made both the meaning and pronunciation difficult to parse, and was one reason why the system was gradually abandoned, to be replaced with Hangul , after the 15th century. In this respect, it faced problems analogous to those which confronted early efforts at representing the Japanese Language with Kanji due to the grammitical differences between these languages and Chinese .
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