The man was Hongjun. In Untainted Land, besides Minghe, only Liu Er, Tongtian, and Hongjun had reached the Realm of Origin. Liu Er could not possibly come here. Sect Leader Tongtian had separated himself from the Way of Heaven, but he still needed time to restore his cultivation. Hence, the man was just Hongjun. Minghe knew that Hongjun could go to the Chaos anytime based on his cultivation, despite he had no idea about the condition of Hongjun's injury after his separation from the Way of Heaven.
To Minghe's surprise, Hongjun could find him. Consciously or unconsciously, Minghe was a little afraid of Hongjun. Hongjun's cultivation was profound. Meanwhile, he was the incarnation of the Rakshasa's remnant soul. Thus, he knew something about the Chaos and fully grasped Rakshasa.