China onarrival transit visa.

Dear sir/madam.
I have booked china eastern flight go and return srilanka. I am sri lankan citizen and working in south korea.

When i came on my vacation to sri lanka from south korea i didnt need to get transit G type.

But, next week when i want return to south korea from colombo, i have a transist at kunming airport for 14 hours.

So, as a srilankan passport holder and worker of korea. May i able to get online transit G type at china airport?
Or must i apply to the colombo chines embassy?
Please reply me.