Zhang Yi is undoubtedly very interested in the treasure of ice system. We should know that Zhang Yi practices ice-fire Jindan. For this kind of Jindan, we need to realize the extreme energy of ice-fire before we can begin to realize the origin of Jindan. Finally, we can combine the two comprehensions thoroughly before we can completely practice our own Jindan successfully. So for Zhang Yi, it is necessary to understand the energy of ice-fire Jindan. Zhang Yi's heart is undoubtedly very exciting for this kind of benefit. However, compared with Chenghua Dan or something, Zhang Yi attaches more importance to this kind of thing, because Zhang Yi's heart undoubtedly...