Please check my question I have flight tommorow.

I have flight 3 rdDecember 2016 from Incheon around 9 pm via air China CA 4778 at this flight will reached around 9:40 China time at Quingado airport TAO Qingdao operated by Shandong airlines and then I have layover around 8 hour.
Next day 6 am I have flight for new Delhi. Shandong airlines SC 8829 to new Delhi.
Do I need any kind of visa. I am already in Seoul and I was traveling since one month . It was tour of Japan and south Korea.
Please answer me urgent basis . What must I do now?