Ha Rin is Sae Byeok's younger sister, only by a couple of years. Still reeling from her sister's disappearance, she's haunted by unanswered questions. When a mysterious man offers her a card promising to reveal the truth, she's faced with an impossible choice. Little does she know, her fate was sealed the moment she crossed paths with Dae Ho. (SQUID GAME SEASON TWO-THREE)