Everyone knew that the Shen family had only one eldest daughter, but they didn't know that she was a twin.
A prophecy that "if twins are born in the family will bring chaos to the country" caused the Shen family to hide their young daughter in the dark. She has no name of her own, no identity of her own, and can only occasionally walk around wearing the name of her eldest sister. When she was young, she once saved the fallen prince in the name of Shen Yao, but also quietly left her true heart behind.
Many years later, the young prince ascended the throne and became the new king of Daye. Everyone thought that marrying the eldest daughter of the Shen family was an honor to the heavenly family. Only Shen Yao knew that this was a fatal situation that was destined to see blood. So she entered the palace on behalf of her sister, thinking that she could protect her family, and that she could fulfill her old dream.
But on the night of the wedding, the palace doors were locked and the imperial army surrounded the palace. She was still wearing her wedding dress, and she was waiting for the news that the entire Shen family was being executed.
He kept saying that he married her to protect her; but it was also him who used the blood of her entire family to secure his throne.
Later, she lost her child, broke off her old relationship, faked her death and left the palace, and reunited with her eldest sister who had narrowly escaped death. Since there is no room for twin girls in this world, they will join forces to overthrow the world. Entering the palace in the name of eldest sister made the world remember her name.