Jiaheng is lost.

He has no one left in the world - no one but his three-year-old son Zitao. He's still living only for him, he's walking for him, he's breathing for him.

Even if with Zitao comes too many sad memories, Jiaheng loves him. But he knows that as a rogue he won't last for long, not when he has no money and no roof over his head. His old pack had collapsed under a sudden insurrection and now he has nowhere to go, he's left by himself, weak, tired and injuried with his son that needs to be protected from the cold and the hunger.

He's about to give up and leave Zitao completely alone in that cruel world, when a red light explodes and change once again his already confusing life.