Hangul is the script you are thinking of, which was invented and introduced in the 15th century by King Sejong.
However, there are many Chinese loan words in Korean language, especially on an academic level. You can even find Chinese characters in Korea today, usually in newspapers, on street or restaurant signs. For example, the Korean word for "president" is 대통령 (Taet'ongnyeong), but in newspapers it may be written as 大統領, which are the matching Chinese characters.
Also, most Korean parents choose Chinese characters to write for their children's names, which read (more or less, as Korean does not have tones) the same as the Korean characters.
Hangul is the script you are thinking of, which was invented and introduced in the 15th century by King Sejong.
However, there are many Chinese loan words in Korean language, especially on an academic level. You can even find Chinese characters in Korea today, usually in newspapers, on street or restaurant signs. For example, the Korean word for "president" is 대통령 (Taet'ongnyeong), but in newspapers it may be written as 大統領, which are the matching Chinese characters.
Also, most Korean parents choose Chinese characters to write for their children's names, which read (more or less, as Korean does not have tones) the same as the Korean characters.