After getting the complete translations and corresponding movement routes for the sixth and seventh illustrations of the Secret of Longevity from Annie for free, Fu Junzhuo ordered Xu Ziling and Kou Zhong that very night to immediately forget the first level of the "Nine Mysterious Technique" she had just passed down to them—a technique that had triggered a qi response on their very first attempt—and formally switch to practicing the Secret of Longevity.
Since the Secret of Longevity consisted of seven illustrations, while she had only memorized the final two, Fu Junzhuo decided after some thought to have Kou Zhong practice the sixth illustration, which focused on "movement," while Xu Ziling practiced the seventh, which focused on "stillness." That way, their inner qi would be hot and cold, yang and yin, and by practicing together, they could achieve the supreme state where they complemented each other and yin and yang merged.
Of course, in Fu Junzhuo's eyes, the best method would have been to exchange the original Secret of Longevity with Song Shidao, who had surely secretly memorized and copied all seven illustrations as well as the translated text of the first five, then compare the two versions and complete the annotations for the full translation and all the movement routes of the Secret of Longevity.
But!
Having already received more than enough favors from the Han people and unwilling to ask anyone for help again, she ultimately could not bring herself to make the request when Song Shidao did not take the initiative to approach her. After several days of travel, they reached Cuishan Town. Her injuries having fully recovered, she decisively took Xu Ziling and Kou Zhong ashore and drifted away, saying that she was preparing to return to Goguryeo.
Annie likewise declined Song Shidao and Song Lu's