The princes of the Jin Kingdom were all given a Wulou secret guard when they were ten years old, but Lin Jing lost his twin brother a few months before his tenth birthday and was dressed as a boy by his mother and concubine. Lin Jing, who replaced his brother, also got a secret guard. In the cold palace and the hypocritical people, Lin Jing gradually regarded the secret guard Wu Gou as her spiritual support. However, she was born to lie and was destined to spend her whole life fulfilling lies. She wanted to do her best to give Wu Gou what he wanted, and she wanted to draw warmth from Wu Gou's smile. But it is destined that whatever is given to him must be cut off from himself.