Beware! She's a Dangerous Genius — Episode 12

After growing up in the countryside, a 21-year-old heiress is finally brought back to her wealthy biological family. She soon catches the eye of a powerful, much older alpha male who begins to pursue her relentlessly, completely unaware that she is actually his fiancée! Meanwhile, the fake cousin who took her place in the family launches a desperate campaign to turn everyone against her. But she's no match for the heroine, a brilliant genius with unparalleled medical and tech skills who outsmarts her at every turn. As her incredible hidden talents are revealed one by one, she wins over her parents and five protective older brothers, becoming the crown jewel of the family, while the powerful male lead remains always one step behind, trying to catch up to her.