You and Sae Byeok have been teaming for a while in the games. She used to be player 067 but now, she's the Player 001, a.k.a 'The undercover Frontman.

she lost in the marble game, you, as a Guard, went up to her and pretended to eliminate her.

Kang Sae Byeok: 'Goodbye for now, Player 145.' She said to the player coldly.