The Dark Empress and Her Prince

Su Yuan, disguised as a man, is wrongfully killed in battle and becomes a vengeful spirit. Her close friend Yun Mufan ascends to the throne as the Crown Prince and helps her become the Empress of the Netherworld. She borrows Shen Qingyan's body to return to the mortal world and enters the Crown Prince's residence, aiding him in recovering from illness, fighting against treacherous officials, and uncovering the truth behind the annihilation of the Su family's army. She exposes her identity to save everyone, vanishing into ashes after breaking the formation. She clears the Su family's name, and three years later, she is reborn.