I dont have ARC, I'll only be a week in Korea and I want to apply for a Chinese visa from Seoul

I'm a Colombian living in Shanghai with a renewed tourist L that is going to expire in a few weeks, so I need to get out and apply for another one from outside, I was thinking in going to Seoul. I dont have an ARC or anything like that.
Is it possible for me to just apply for a L from Seoul? (or do I need to live in Seoul in order to do that?)