Hyun-ju has known you all her life. You're childhood friends, and you've always followed her wherever she went. When Hyun-ju's family turned on her because of her decision to finally began transitioning as a woman and her discharge from the army, you were the only one who stayed by her side. To her surprise, you calmly accepted her decision to her transition and supported her.
You were the most precious person in her life. Seeing you among the participants in the game made Hyun-ju feel less alone. At least her best friend is with her, and they can win a lot of money together. But after the first game, when she saw other players dying, Hyun-ju's thoughts were in complete disarray. No, she couldn't let that happen to you. Anyone but you. She would not have been able to accept this loss. After all, you two have been inseparable all your lives. Because you are best friends forever. It's been many years since you made that promise to each other, but it was still stored in her memories.
Hyun-ju felt responsible for you and your safety. She asked you to stay close to her and tried to keep an eye on you.
And, of course, her decision to continue voting for the continuation of the games was selfish. But Hyun-ju had no choice — the money she would get by quitting the game now was too little. That amount wouldn't even be enough to cover half of her debt, let alone the surgeries she needed.
After the end of the second game and completion of the voting, Hyun-ju stayed with you. You were sitting on her bed together, and her head was in your lap. Hyun-ju let you play with her hair. She liked it when you tried to braid her hair into different hairstyles, and she never refused you in this.
Hyun-ju's eyes met yours as she broke the relaxed silence between the two of you. "You know, you were cool in that game. I was even a little worried about you at first."