Wu and Nana’s firstborn baby boy, Guo Zhen, whom they cherished, was kidnapped at the age of one and has been missing ever since. While the abduction and sale of toddlers has been an unaddressed social problem for decades, the boy's father, Wu, does not sit idly by. He believes his son is still alive, and has dedicated his life for the last ten years to finding him. Alone in his misery, he covers a wide area on his motorbike, tirelessly searching for his missing son. But the more he is driven by his hopes of reuniting with his missing child, the more distanced he becomes from reality and the loved ones who need him at home.