Investigator Yuan Jun was rescued by an international student named Zheng Yiwei while performing a mission abroad.Four years later, Yuan Jun served as the chief of the reconnaissance department. Unexpectedly, the first opponent he encountered was Zheng Yiwei, a dispatched spy who was named Su Manqing after plastic surgery.Zheng Yiwei is the daughter of former director Zheng Yu who ran away from home ten years ago without any news.