Well yeah, it's "hard" because the other transported people were retards who can't read. And by that i mean [Spoiler Alert]
the limit break skill allows one's level to go up, otherwise all of them are stuck at lvl 1 forever, and since the mc is "smart" enough to use his eyes he got this skill.
Imagine snails... They born with their house, but still too small and soft to protect themselves. When they grow up, their house get bigger and stronger.
I liked it way more as the plot