Modern badass Pei Yingning time-travels to become the useless legitimate daughter of the Grand Tutor's estate. Right at the start, by a twist of fate, she shares a night with the aloof Prince Chuyang, Yin Xiaomu! Forced into a arranged substitute marriage to become a scumbag father's spy, she simply flips the chessboard over. Armed with firearm manufacturing techniques, she charges ahead like a powerhouse, tearing apart her vicious stepmother and blowing up the crown prince's estate, turning the capital upside down! Meanwhile, the cold-faced prince who originally threatened revenge falls step by step, transforming into a "wife-protecting maniac" and an ultimate jealous vinegar jar. The two join forces to cleverly break the crown succession conspiracy. Watch how the hardcore princess teams up with the black-bellied prince for thrilling face-slaps and a counterattack against the wind!