One who remembers only a part of her existence and one who remembers their painful promise that they never fulfilled.   SPOILER: Yerin never forgot her ex-girlfriend, SinB, and tries to find a way to... ForewordHope youll enjoy this Sinb and Yerin Fan Fic. Btw, you still have to guess what the ending will be because it will ultimately be depending on my mood if it will be a happy or sad ending. :P