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Three people now face a decisive moment : a grandfather ( Song Young-chang ) who lost his granddaughter right in front of him , a mother ( Uhm Jung-hwa ) searching for the person who abducted her daughter 15 years ago , and a detective ( Kim Sang-kyung ) with a guilty conscience attempting to crack the long-unsolved case .
 Uhm Jung-hwa, Kim Sang-kyung
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Uhm Jung-hwa, Kim Sang-kyung