Eligible for the 72 hours?

Hi I have a round trip flight starting in Vancouver-Shenyang-Chengdu- and final destination in Seoul. I got lost reading about the only one stop allowed. Can I get a 72 hour visa and leave the airport in Chengdu? (I have a 25 hour layover there ). I want to stay the night at a hotel in chengdu before continuing on to Seoul. Can I? Thanks