Visa for foreigner in Korea

I'm a German citizen, currently living in South Korea. I will leave Korea soon and fly back to Germany, but in between I want to visit a dear friend in China. After my visit in China, I would like to return straight to Germany (without returning to Korea). Since I want to go to China when leaving Korea, my Alien Card won't have 6 months validity remaining. Does that mean, I have no possibility to obtain a Chinese visa in Korea - and instead have to ask a agency in Germany to get me a visa there and send it to me to Korea?