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In her previous life, Su Wanqing watched her best friend die tragically in front of her to protect her, but she was powerless. After a new life, he discovered that his friend's tragic death was not an accident but a conspiracy. She swore that she would kill her enemies with her own hands. From then on, there was a demon doctor with a weird and mysterious personality in the world. Everyone said that the demon doctor was ruthless, cruel and bloodthirsty. But only she knew what she had experienced in this life... Until one day, he said: You are the most compassionate and righteous person in the world.