When a young woman wakes up inside the novel Brigitte Wants to be Happy!, she isn't the heroine—she's Princess Yerenika, the heroine's aunt who is destined to die tragically before the main plot even starts. To make matters worse, she's stuck in a world saturated with magic that her body can't handle. Her only relief comes from being near Emperor Euredian, a man radiating divine power that acts as a shield for her fragile health. But Euredian has a dark fate of his own: he is destined to marry a wicked woman and father the psychopath who will one day ruin the world.
Determined to save herself and the future, Yerenika decides to take matters into her own hands. Her mission? Seduce the stoic and intimidating Emperor Euredian to prevent the birth of the future villain! What starts as a survival strategy quickly turns into a hilarious game of cat-and-mouse as Yerenika's clumsy but earnest flirting chips away at the Emperor's icy exterior. Flirting With the Villain's Dad is a delightful isekai romance filled with witty banter, high stakes, and a heartwarming relationship that proves love can change destiny.