Postnatal experts cultivate the physical body; therefore, it is relatively easier to discern their cultivation level through every single breath and step they take, which reveals their realm.
Of course, what is deemed relatively easier to discern is only in comparison to Liu Wentian; it is impossible for ordinary people to perceive it.
Zheng Hongtao was undoubtedly the strongest person Liu Wentian had encountered since he had received his inheritance; even Liu Wentian already felt a thread of threat from him.
Liu Wentian was now at the Martial Universe Realm, merely at the Postnatal Peak, but armed with his martial comprehension far surpassing that of Postnatal Peak and cultivating the more mystical "Heaven and Earth Demon Gods Technique," ordinary individuals at Postnatal Peak, even two or three of them, would not pose any real threat to him. Hence, Zheng Hongtao could at most make him feel a hint of threat but was not truly a threat to him.