Is he also an Internal Arts Master? 2

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Could it be that he was an Internal Arts Master from the legends?

Su Zhenggang had come from the military, and while there, he had personally witnessed an Internal Arts Master use palm force to smash a big rock, which was truly shocking to the core.

He knew that although he could be considered an expert in external martial arts, in the eyes of an Internal Arts Master, such external martial arts masters like himself really didn't amount to much. At the moment, Leng Xuan didn't seem to have anything extraordinary about him; on the contrary, from his appearance, he looked more of the delicate and scholarly type, unlikely to be a master of external skills. It was precisely for this reason that Su Zhenggang suddenly thought that Leng Xuan could very likely be a master of Inner Strength!