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Lord Star Du E's suspicions were reasonable. The reason they had never considered Su Xin as someone from the Netherworld was that Su Xin showed absolutely no trace of being a Netherworld person.
Based on his actions in the Jianghu ever since his debut, he was far from being a heartbroken person.
Therefore, Heavenly Court had identified Ksitigarbha's identity early on but never associated Su Xin with it. As for the timing, like Lord Star Du E said, perhaps King Chujiang had already advanced to the True Martial Realm long ago but just hadn't revealed it until now.
Emperor Ziwei of the North Pole sneered and shook his head, "Even though you all think it's impossible, this is actually the most likely possibility.