I was told by my beloved readers that you can actually get better discounts from respective countries' KTO (Korean Tourism Organisation). I am not sure how true is this cause I can't check it personally in Malaysia.
The highest discount that I could get so far is only 10% from KTO plaza near City Hall, Seoul (you can get the coupon at any Tourist Information Center as well) or from Everland website here.
One day ticket is 40,000 won.
So after 10%, I get 36,000 won. This only covers Everland and doesn't include Carribean Bay's admission. You can enter from 9am and spend the day till 9pm.
When I checked at the Group Ticket Office in Everland; if more than 20 people in your group you can get 33,000 won per pax instead of 40,000 won per pax. But my group is about 6-8 people at most so I would never be eligible for higher discount. :(
How to locate Group Ticket Office?
Once you alight from the Everland Shuttle Bus, walk to the main entrance where people queue up to buy individual ticket. You can't exchange your discount pass there, walk to the right about 100m and you will pass by the group ticket admission. You will see Group Ticket Office sign post and the office is just nearby.
Send Free Postcards from Everland!!
How to go to Everland? Details in here