Which visa for two layovers en route Seoul to Kathmandu and back?

I am a Canadian citizen booked for a round-trip itinerary from Seoul, South Korea to Kathmandu, Nepal departing Aug. 2, 2013 and returning Aug. 17, 2013. I have two layovers en route on the way there (14.5 Hours in Qing Dao and 3 Hours, 40 minutes Kunming) and two layovers en route on the way back (10 Hours, 10 minutes in Kunming and 1 Hour, 55 minutes in Shanghai).
Please advise if and what type I will require for the layovers.
I have two layovers en route each way (Qing Dao and Kunming).