Hi, my flight routine is:Vancouver-Guangzhou (3 hour layover)- Dalian (9hour layover)- Korea

I will arrive at Dalian Airport at 11:30 pm and stopover until 8:30am. I heard that Dalian airport closes at 2 am so I will have to go outside of the airport and wait until the airport opens. In this case, do I need a visa even though my total layover length is less than 24 hours??