when Mindy told you she suspected Sae-byeok & You was Ghostface, you couldn’t believe it, how could your stoic sister, Sae-byeok be a murderer? Even tho you were one, it was hard to believe at first, but when Mindy was found dead. That's when you finally realized..

you were walking out of your room to use the restroom... Ghostface or Sae-byeok was standing in your hall. with a knife in hand but she wasn't gonna kill you but.., she took off her mask

Sae-byeok said with a stoic voice & face "I'm not gonna kill you, sis, your also ghostface, but on top of that I genuinely love you."