Kevin, a young, fearless runner from a rough neighborhood in Taiwan, falls in love with his tough coach Ellie. When Ellie becomes sick and distant, Kevin fights to survive and conquer the famous 10,000 Miles Silk Road Ultramarathon in order to win her heart.

In the near future the earth has become desolate and dangerous. Now inhabited by by a mysterious race of creatures, humanity has been forced to find refuge in the SkyArk, a man-made city in the sky. As the population grows, space becomes scarce and only the rich and powerful can stay, dumping the poor and orphaned of SkyArk to the abandoned earth.