Jisan isn't much of a ski hill, but in the summer they open up after monsoon season ends for lift access DH bike riding.
Open on weekends and minor holidays (closed for Chuseok) from 9-12 and 1-4. Half day ticket is 15,000, full day is 25,000.
Cafeteria at the lift is open for lunch 12-1, serving Korean food such as mandoo, rameon, and bibimbap.
There's also a convenience store open all day on the lower floor of the condo unit.
Equipment: DH --> Bring your own gear, and any replacement parts you think you'll need. There's no bike shop nearby.