When Wu Xiangyang happened to meet Shang Jingran with his son on the street, he felt kinship and wanted to save the broken marriage between the two. Shang Jingran felt that Wu Xiangyang loved her deeply and accepted an unrelated child for her. The two got back together by accident. But what is the truth: is the child an illegitimate child of her sister and her beloved as she knows, or is he his biological child as he thinks?