to all the native teachers here ranting. before you come to korea read your own country immigration code a see how it applies to foreigners working illegaly or overstaying in your country without proper documentations.

your temporary stay in korea under a e2 visa is TEMPORARY, same as for any foreigner applying for a h2 visa in the us or other visas in other countries you come from.

during you temporary stay in korea working under a valid e2 visa, you have not rights to talk about unions and all the full rights native koreans have. If for any reason you can not renew your visa at your contract's end, then go back to your country immediately. also if the owner of the school does not give you the promised e2 visa, find another job quickly as you can and get the visa. any school that does not give you the e2 visa can not report you to immigration or claim that you breached your contract. so be resourceful and move fast to get an e2 visa in any case.

by overstaying in korea without proper docs:
you become an ECONOMIC REFUGEE same as the raftboats coming from Laos with 700 hundreds people aboard. so please accept the true as nobody as i know in korea wants to put you down of mistreat you for nothing. the more you keep dening this and not accepting to take your place as a quite and humble ECONOMIC REFUGEE, the more you create hundreds of mary chois.

if you have bad experiences with previous employers,its happens, we have our share of rotten apples as any society. just keep moving forward, get your proper docs, and look at us as your friends, not your enemy masters.