Not sure of your timing, but if it's not too tight, you should also be able to apply for a South Korean visa from within China.
Otherwise, I know NOTHING about Korean visas...you should check their Consular web sites for the latest info. Links to Consulates can be found in our Links pages...
One other issue I've thought of, though...you DO know, of course, that you can't work in EITHER country legally on a tourist visa? If you're planning to work, and you don't know about Work Permits, Residence Permits, Z Visas, etc. and their South Korean counterparts...you need to get straightened out toot sweet.
I've seen your picture, and you're way too cute to be jailed or deported.