Mia Sullivan, who has practiced martial arts for 20 years, is taken back to the Sullivan family by her biological parents. The fake heiress Chloe Sullivan sets up traps everywhere to humiliate her. But the straightforward Mia always takes Chloe's schemes as kind gestures. Chloe's plans fail one after another, repeatedly backfiring and embarrassing herself in public. Mia relies on her own skills to shine in the Sullivan family.