Excellent. Great places to get started off the main lake and the boat waves Would you know if I will need to pay to park or launch?
The cove area is just a little dirt road off the main road. Just park in a place that doesn't block anyone else.
The other area has a big parking area and small camping ground near a soccer ground, and as far as I know there isn't any parking fees.
As for launching fees, most places in Korea don't charge for launching, mainly because the ramps are rather poor, not what you'll be used to back home.
Just south of the soccer ground there is another launch that is used by the "boating licence school" and they may charge a launch fee, but everywhere else is free.