Do I have to go to a consulate to apply for a chineese visa?

hi, i am living in Ulsan, and would like to get a visa for China, leaving at the end of July. I have 7 months left on my Visa and allien registration card. Do you know if i will have to go to busan to apply for a visa? Can i send it through the mail, or can i find a travel agency in Ulsan to help?