Before Qiao family's only daughter Qiao Yuxuan enters school, nanny Sun Jinlan snatches her black gold supplementary card, makes her daughter Qiao Zihan impersonate the heiress, and forces Qiao Yuxuan to dress up as the nanny's daughter. Relying on unauthorized card-swiping, squandering, and bribing classmates, Qiao Zihan falsely claims to be the Qiao family's illegitimate daughter and snatches Qiao Yuxuan's fiancé Shen Yuanzhou. Qiao Yuxuan does not rush to argue, but instead preserves surveillance footage, consumption records, and recordings, exposing the mother and daughter through a two-million-yuan banquet, fake authorization, and campus rumors. Ultimately, the unauthorized card-swiping behavior is investigated, and Sun Jinlan's moral kidnapping of gratitude and the past switching of daughters are also exposed. Qiao Yuxuan breaks off the engagement, rejects reconciliation, and walks towards an independent life accompanied by her new partner who respects her.