Jiang Li had just broken through to the Golden Core realm, but immediately after, he entered the state of fusing the five cores.
Most of the Golden Core aura was locked in his Qi Sea. The bit that leaked out was also obscure and unstable.
Therefore, if he did not deliberately reveal it, ordinary cultivators would not be able to see through Jiang Li's cultivation at all.
Mu Chunkong's vision was not bad, and he saw a bit of Jiang Li's aura.
However, he had an unstable aura and had also eaten a precious Earth-rank medicinal pill, the "Body Repairing Golden Wyrm Pill" some time ago. Thus, the dense medicinal qi in his body had yet to dissipate.
This situation looked very similar to those second-generation cultivators who relied on medicinal pills to raise their cultivation levels.