C153

The cave was pitch black, and he couldn't even see his fingers in front of him. The temperature inside was much higher than outside, and the further in he went, the more obvious it became. So much so that Liu Chengfeng wondered if this cave was a living volcano, and this cave was a branch of this volcano.

Liu Chengfeng told Shi Shan his guess, and Shi Shan agreed with his guess