Hello, dear, the cruelest thing the Queen said in the biography of Zhen Huan was in the fifty-first episode, when she said to Zhen Xuan, "You Zhen Xuan seem to have forgotten that you are not my son's biological mother, and you are not from the current throne, but I am!" This sentence made Zhen Xuan deeply aware of the gap in identity and the ruthlessness of power, and made the audience even more disgusted with the Queen's behavior. I hope it helps you, and I wish you a happy life!