So a map, language, and clothing he hasn't seen before makes it a different world... then what would you call a different country and culture, add on the thousands of existing languages and you get another world reachable by plane...
Add on that not everyone has access to phones and electronics...
Got to say this but alot of Korean manhuas got this issue of jumping between events, what did he get after the test? What happened with the tribe that organized the event? Why was the dude with the bird trying to take the tribe over? What about the 4 assassins? Why?
Just read 4 chapters to see why it got such a low rating, would have expected at least someone to give a highish rating... But it's rating seems very suitable.
Doesn't seem to have a story...