I Mistook My General Husband for Someone Else, Then Became the Crown Prince's Consort

I have severe face blindness. The moment someone is out of sight, I forget their face. A year into our marriage, my husband and I were deeply in love. One day, a man in armor showed up at my door, claiming to be my husband. He had a pitiful-looking woman in his arms. "Yiyi saved my life. I relied on her care for a whole year at the border. I’ve already promised to marry her. From now on, she’ll be my secondary wife in this household. You mustn’t mistreat her." I blinked in confusion, looking from him to her, then smiled politely. "Who are you?"