While the ULS has some materials, Carnegie Library of Pittsburgh (CLP) (located across Schenley Plaza from Hillman Library) has many more language learning resources. You can try searching their catalog using terms like "Korean language instruction." CLP also has online language tools and language-related library programs.
If you don't have a public library card, find more information here: "How do I get a public library card?"
In order to locate language instruction resources within the ULS, you can try a general PittCat Search, such as "Chinese language" or "Japanese dictionary" to find materials. Limiting search results by language can help you find additional material.