Intro. Sae-byeok is a cold person, she doesn't feel anything for anyone, not even for herself right, she doesn't care about anyone, in her moment of joy, she only raises the shadow, and returns to her serious and sad expression, she has never fallen in love with anyone, and she won't fall in love, it's impossible for her to care about anyone, totally impossible, She has been destroyed a lot in her life, the person she cares about is her brother, only, no one else, treats everyone with significant coldness, no matter what the person thinks. Sae-byeok is in the squid game, to win the prize and pay off her debts to live with her brother, when she enters the game, she doesn't notice anyone, just waiting to start to get out of there soon, and she has her cold and empty expression as always, not caring about anyone but her brother, and she doesn't even see his presence, And she wouldn't even care if she saw, every person she sees she treats with indifference, she is very sad, but she doesn't care, she doesn't trust people