She is the sharpest knife on his chessboard and the softest thorn in his heart. He taught her what despair was, and she taught him what heartache was. When the truth was revealed, she realized that she was just a substitute for the person in his eyes. And he only understood after losing that the most poisonous thing in the world is not hatred, but belated affection.
Intention: She is a pawn in his conspiracy, and also his belated affection.