Left luggage service at Kunming South Bus Terminal

I am going to Yuanyang Xinjiezhen to see rice terrace and would stay 1 night there. But I do not want to take big suitcase along.

Is there a left luggage at South Bus Terminal?
Do they accept over night left luggage service?
How much for the charge?
What time of open-close of left luggage counter?

Thank you very much for the answer.