Generally, the boiling temperature of water in a sauna isn't that harmful. Still, it would be an entirely different case if the temperature were to rise drastically higher than that. Satoshi and the others knew exactly that, but they still went through with the challenge since they didn't want to go back on their word.
Besides, they were keen on winning the entire thing, so there was no way they'd rush out first and risk screaming a love confession by the rooftop. There was no going back now since the challenge had already commenced.
"Are you kidding me, Satoshi?" Himuro gritted his teeth, as the steam painfully stung his skin.
"Seriously, Satoshi?!" Yun Zhe also exclaimed as he desperately covered his face, somehow partly blocking the steam that threateningly oozed out from the stones.
RIP hahhahha, now Jonathan, it's time for you to confess your heart,