Adult Judo class in Guseo Dong, which is close to Guseo Subway. (2 stops north of PNU)
Head instructor is a sixth-dan master, so it doesn't get much better than this.
Lots of standing work and jujitsu-style groundwork is possible, too.
Both men and women welcome, and you don't need to speak Korean.
Actually, it is probably a great place to practice your Korean.
Class starts at 8:40 pm Monday to Friday.
I believe the price is 130,000 won monthly. Uniforms can be lent at first.
Feel free to contact me here if you have any questions.