You wanted all of that revealed in the first episodes, huh? We already got one exposition lecture in the first ep.

This takes place in Korea, not Japan. I seem to recall school isn't free of charge in Japan, not sure of Korea. The same for medical treatment.

Yeah, this did make the adventurers look prettu dumb. On the other hand, this was clearly a dungeon different from anything they had seen before, so being veteran adventurers would only work against them, since they couldn't help but try to draw inspiration from their previous experiences when solving problems, but it was utterly useless here, with the enemies being basically unkillable and the way out being a puzzle. They were all in panic, to boot.

The MC would have been painfully consciouss of the fact he's the odd man out (the weakest hunter in the world), despite this series refreshingly not making all the other adventurers be scumbags about it. I guess that was a detail that comes from this being manhwa, not manga, as in Japan he would have been the laughing stock, instead of receiving quite cordial and sympathetic treatment. Nevertheless, he would know he's still only tolerated as an adventurer, fighting for scraps and relying on the healers goodwill to remain alive at all. Such a position wouldn't make him easily deal out advice/suggestions vocally.