C385 Succeeding in Producing Steel!

"Why is it so hot outside?" There were the first words that Feng Yu Heng said after stepping outside.

Because the furnace was hot, they wore thin clothes. After stepping into Xu Tian Cave, they felt a little cold and put their Winter clothes back on. Xu Tian Cave was cold for the entire year, even during the hottest days of the year, one would need to wear a thick sweater