Although he had been in secluded cultivation all this while, he could actually sense what was going on in the outside world, and was thus aware that Daoist Wen wanted to kill him.
This made Wang Mang furious. Had Zhu Long not acted, then he would have been in an incredibly dangerous situation, and would have likely needed to flee this world in order to escape.
His breakthrough might even have been interrupted!
Although he had already successfully sent his true soul into the three great rivers, he still needed to absorb more power in order to fuel his breakthrough and transform.
If he was interrupted during this process and failed his breakthrough, he might never have been able to reach Tier 5 again in his lifetime!
That thought alone was enough to make Wang Mang hate Daoist Wen.
He had seen despicable and shameless people, but he had never seen anyone more despicable and shameless than Daoist Wen.