《初嫁》讲述了女作家冯雨霁（乌日丽格 饰）为给双胞胎姐姐报仇顶替了姐姐沈府少奶奶的身份重回沈府，期间结识沈家二公子沈檀谦（于杨 饰）并开始调查真相，由此揭露了一个埋藏已久的凶案真相的故事。
The story follows Feng Yuji, a woman living under an assumed name, who returns to the Shen household under the guise of her twin sister, the young mistress of the Shen family, to seek revenge for her sister. She gets close to Shen Tanqian, the son of a wealthy merchant, and begins investigating the truth behind a long-buried murder case, ultimately revealing the true culprit and ensuring they face justice. Throughout this journey, Feng Yuji and Shen Tanqian move from mutual distrust to open honesty, and eventually, they heal each other. With courage, wisdom, and the power of their sacrificial love, they bring the truth to light. As the truth unfolds, their combined efforts also eradicate the Shen family's opium trade with the Japanese, gradually ending the city's opium addiction and establishing a new era of science and civilization.
