The Mortal Warrior Project that Yan Yu knew about only came to the forefront after the massive purge within the Annan Army.
But in fact, similar theoretical research had already been underway. In this regard, Lu Country had a unique advantage: it had a teacher, Mei, who had studied the Taoist scriptures and understood the practice of cultivation. She naturally led the research on Spiritual Energy, far ahead of other nations.
Teacher Mei was responsible for the basic theoretical project, which was currently the openly acknowledged focus of research in Lu Country.
As for the engineering application projects, they were necessarily conducted in secret.
The number of people involved was unknown, the location was unknown, and even the progress of the research was not disclosed. There were only a handful of high-ranking officials in Lu Country who were aware of this matter; even Mei Yingxue knew nothing about it.