I can't make it to normal business hours.. how can i apply?

Hello,
I am an American living in Seoul on an e2 visa. I will travel to China for 5 days over a holiday break. Unfortunately, my working hours are the same as the embassy office hours so I cannot go in person to apply. Can i mail courier my passport and documents to the embassy? What exactly do I need to send? Which office address and department should I send it to?