Two best friends transmigrate into sisters, spies for an alliance marriage. They marry Prince Jasper (cold God of War) and Prince Aidan (flirtatious, cunning). The brothers are wary, even attempting to kill them. They never expected the 'master spy' is a bookworm clueless about love; while the 'naive girl' is a Queen Bee who outsmarts him. A sweet counter-attack full of misunderstandings begins.