One day, an unknown virus broke out on a large scale in China and quickly spread to the world. Anyone infected with this virus becomes a walking zombie, unable to see, speak, or feel hungry. They only retain the functions of hearing and smell, and have a strong desire to attack. By biting normal people, the virus spreads faster. The disaster spread rapidly and panic spread across major cities in China. When the Chinese government and the Centers for Disease Control and Prevention were working hard to develop a virus vaccine, administrative assistant Zhang Xin and his four-year-old son Zhang Wang, like most of the little people who fled the disaster area, also joined the fleeing team. However, Zhang Xin and his son were accidentally dispersed by the crowd while fleeing. From this, Zhang Xin began his journey to find his son...