EZ Drum (이지드럼) is located out of Shinchon Station (신촌역, line 2) in #202 of the Eunha Building. It's open Monday-Friday 4-10 pm, and Saturday 3-7 pm (which is for individual practice without instructors). You can schedule a free lesson to see how you like it before you decide whether or not you'd like to join. Membership is around 100,000 won/month, and you can purchase drum sticks here for 15,000 won new or 10,000 won pre-owned.
You can go to their website http://www.ezdrum.co.kr/ezssc.htm, call them at 010-3406-8253, and email them at ezdrum@hanmail.net.
