It was September 1997. Guo Gangtang's son was kidnapped by a woman right in front of their home. Guo got on his old motorcycle, and hit the road to find his son. He has traveled across China, chasing tip-offs for the last 24 years. Guo's story was made into a film in 2015, and his moving reunion has touched millions of people across the world. And he finally got united with son and two suspects have been arrested.