Lin Wan, the female protagonist, seems to be a happy innkeeper. But in the course of her quiet married life, she gradually discovers that her “model husband” and “elegant mother-in-law” share an unusual secret. As she pieces the clues together, she learns that the two were childhood sweethearts who each married under false pretenses to appease social opinion and serve their families' interests. From beginning to end, she was nothing more than a “perfect tool” they had chosen.