After accidentally transmigrating into an ancient imperial harem, Jiang Wan binds herself to a system and mistakenly uses an Obedience Card that is valid for only one day. Believing she can control the tyrant Xiao Chengyuan forever, she spends six months bossing him around and doing whatever she pleases. When she discovers the truth about the card, she is horrified and becomes convinced that Xiao Chengyuan has secretly been plotting to kill her. She hurriedly packs up her treasures and attempts to flee in the middle of the night, only to run into Shen Jingshu and cause a misunderstanding that gets her caught on the spot. Her repeated attempts to test the waters and avoid Xiao Chengyuan are constantly thrown off by his unusual reactions. Eventually, the misunderstanding is cleared up: Xiao Chengyuan had fallen for her long ago and had merely been pretending to obey her. The two finally confess their feelings and Jiang Wan begins her happily ever after.