Sixty-eight-year-old Chen Lan has worked hard for her son's family for ten years, but her granddaughter Jiang Yue, who returned from studying abroad, insulted her as "idiot" in German. Chen Lan responded in German with a pure Berlin accent on the spot, shocking the whole family. She refused to leave home and activated the black card that had been dusted for twenty years, revealing her true identity as a German professor, trust fund beneficiary, and courtyard property owner.
