What he was talking about should be the part of the Shi family's strength that was hidden in the dark.
Song qingxiao frowned and pondered. The Shi family was one of the reclusive families. If an ordinary martial artist from the Research Institute, as Liu Xiao had mentioned, could defeat Captain an in 50 moves, he would at least be at the peak of the lower level of the Dao comprehension realm.
As for the martial arts Research Institute, it was unknown what level one's cultivation base had to reach to be able to enter the center of the Shi family's hidden dark group's strength.
However, based on Liu Xiao's words, he could roughly estimate the true strength of the other underworld clans from the existence of the Shi clan.
These reclusive families that had been around for many years were like old trees with deep roots. They were unshakeable and extremely dangerous.