Looking for older sister, Kim Un Suk, born 56/09/20.

I am looking for my older sister, Kim Un Suk who is born on September 20th, 1956. My name is Kim Hyeon Suk and I am 53 years old. 44 years ago, my sister and I were put in an orphanage in Pyeongtaek. I was 5 years old and she was about 7 to 8 years old. When my sister was 11 years old, she was adopted by an American military family. My birth father's name is Kim Seong Do and my birth mother's name is Im Jung Ja.