How Could Dark Blade Be Willing to Be a Delicate Flower?

She has lost her memory. She only remembered three things: she had killed someone before, her technique was very professional, and she wanted to kill the man in front of her who was passionately devoted to her. He is Gu Yu, the grandson of the British father-in-law. He is handsome, gentle and affectionate, and he holds her in the palm of his hand. She thought she was a heinous killer and liar who defrauded his affection. It was not until later that she discovered that his tenderness was a long-planned revenge, and the murderous intention in her heart came from a mission that she had long forgotten... Is he Gu Yu? Is she a killer? Both of them wear masks, and her biggest mystery is herself...