Pei Zheng's expression was serious. His lips were tightly closed. His steps flurried. His burly figure moved around the passageway like an agile cat, progressing forward quickly.
The spiral passageway was like a never-ending maze. It was plain and boring.
After turning round after round, Pei Zheng's face was still like a stone sculpture. Even if the surrounding temperature had risen to a level that normal people couldn't endure, even if his clothes had already been fried by the high-temperature Qi flow till it curled up, his expression was still the same. In the deepest recesses of his heart surrounded by the extremely cold expression, it had already been boiling. It was just like the lava flow in the underground fire vein, churning repeatedly.
This was an underground fire vein!
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