Two modern besties, Zinnia and Selena, transmigrate into enemy states' "peace brides" — who are actually spies. They end up marrying the Cold-Faced War God, Prince Cameron, and the flirtatious, cunning Prince Caspian. The brothers are wary, but Cameron finds his "master spy" is actually an innocent bookworm obsessed with knowledge. Meanwhile, Caspian's "naive love-struck girl" turns out to be a heartbreaker who's always one step ahead. A sweet, misunderstanding-filled counterattack begins.