About the Bank, money transfer. Your spouse will need the following:
1. Korean ID Card
2. copy of passport info page
3. document from the tax office which shows where the money is coming from (assuming you are sending a lot) and that you have paid applicable taxes on it.
4. proof of intent to move/live abroad. This should be your spouse's COPR or the email stating that they have been approved to move to Canada. For us we used the receipt you get when you pay the PR application fee and the letter I got from immi stating that I have been approved to sponsor her. This was acceptable, but my wife was told that she has 1 year to get her PR in Canada or she is supposed to return the money sent to canada to her Korean banck account. No idea what will happen to anyone who is refused PR and can't move to Canada and no idea how Korea would enforce this.
Once you get all the documents in order it is a pretty painless process, my wife just had to fill out one form and then we sat at the bank for what seemed like eternity and watched the exchange rate slowly get worse. When we sat down it was 1039.54 when we sent the money it was 1039.90, but we got a discount because we were sending a lot.