An imperial spy enters a fake marriage with an agent from the Holy Kingdom, secretly plotting to sabotage his mission without revealing her true identity. Determined to make everyone hate her, she deliberately causes trouble at every opportunity. But somehow, her attempts at sabotage keep saving lives, exposing criminals, and turning her into an unexpected hero. As her reputation grows, even her suspicious fake husband begins acting strangely. And when he suddenly confesses his feelings, she realizes that ruining his mission might be much harder than she ever imagined.