Basic standards depend on what kind of place you are teaching for.
The average "Hagwon" or private institute pay between 2.0-2.4 million per month depending on your experience, and if you have potential to become a foreign manager. Housing, insurance, pension, and severance are also included. Typically a non franchise "Hagwon" pays a bit less, and the schedules are usually 10am-7pm straight up. Franchise schools sometimes tend to be a bit more flexible, and pay a little more. But of course, a "Franchise" in Korea is independently owned, and the onwers usually do whatever they want. They just pay for the name and the books. These are pretty much all childrens "Hagwons."
Adult "Hagwons" pay better. Pagoda, BCM, or Global English for example have split shifts (i.e 7am-10am/6pm-10pm) However the pay and quality of housing is alot better. You can make upwards of 2.5-4.0 mil a month if you play your cards right. (Remember you'll be teaching adults, and if the schools give you crap, you can always complain to your students)
Public Schools and Universities are the gold in Korea. Housing is nice, and benefits are full. The typical schedule is less then 30 hours a week, full vacation, The average salary in my experience was 2.7 mil per month for a Public School, and 3.0 per month for a university position. With universities the vacation is up to 10 weeks, depending on the uni, but they always offer summer or winter programs for extra overtime.
I highly do not reccomend teaching outside of Seoul or the Gyeonggi Province. I hear nothing but horror stories from private "Hagwons" in the boondocks. They pay the big 2.0 a month, work over 40 hours a week and fire you before your 12th month so you don't get severance. Also the owners tend not to speak English at all, so they'll find every excuse not to communicate with you.