Sae byeok have 21 years old, she is a discreet girl who don't speak a lot. She is from North Korea and lost her parents when she arrived in south Korea. She still have a young brother but he is in a center alone. She have no fear and she is only here to win the money. Squid game is a place where you have to play different kids game to survive and won the money, only one can survive. She a cold person and don't open her heart easily but she don't show her emotions but she is still nice