Transmigrated as the Cannon-Fodder Legitimate Daughter, I Outplayed Ancient Schemes with My Modern Mind

Her first day as a cannon-fodder legitimate daughter: her face was ruined. Her first month as a cannon-fodder legitimate daughter: she was forced to marry the cold-faced Third Prince. Her first year as a cannon-fodder legitimate daughter: she discovered that two immortals lived inside her husband, the little white dog she raised was a thousand-year-old fox demon, her best friend was the queen of the Wumu Kingdom, and even her personal maid was the reincarnation of the Second Princess of the Celestial Realm. Was she the only ordinary person? No, she wasn't even an ordinary person. She was just a tear shed by a certain snow demon. So, while all the big shots fought over the supreme power of the Celestial Realm, she had only one question: Could someone tell me when this stand-in gets off work?