Bankrupt Tang family eldest daughter "Tang Xiaomi", in order to keep her mother's keepsake, is forced to marry into the Pei family in place of her stepsister to bring good luck to the aphasic eldest son Pei Yunzhuo who is to counteract bad luck. After marriage, she unexpectedly discovers that she can hear his vivid and sharp-tongued inner voice -- Pei Yunzhuo closed himself off after being abused by kidnappers when he sacrificed himself to save his younger brother in his youth, and the outside world views him as a "useless person". Relying on her mind-reading ability, Tang Xiaomi repeatedly resolves his crises, going from guarding safety to breaking down his mental defenses, and the two gradually develop feelings for each other amidst bantering and mutual assistance.