This so-called Yin and Yang energy naturally did not refer to the Yin and Yang energy from heaven and earth, but rather the male Yang and the female Yin. Put nicely, it would be called Yin and Yang energy, while bluntly put, it would be called twin training energy. A more pleasant name for the people who utilized this method, would be joyful grandmasters, while an uglier term would be corrupt practitioners, and an uglier term would be… pervert.
Hence, when Lin Dong discovered that the owner of this old tomb had actually relied on this method to advance to the Nirvana stage, his face turned immensely exciting. Then, he turned to look at Ling Qingzhu, who was sitting in mid-air on her green lotus.
