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Later in 2011 , Park released singles " Demon " , " Girlfriend " , and " Star " , co-starred in the Korean movie , Mr. Idol , and joined the cast of KBS ' Immortal Song 2 .
 Korean
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Korean