Zombie Crisis:Battle for Survival - Zombie Crisis Series, #1

In a world ravaged by the zombie virus, Aiden, Lily, Jack and Tom continue to struggle to survive. They have encountered countless zombie attacks and have narrowly escaped death time and time again. Later, they met a scientist and learned the truth about this disaster. They fought against mysterious organisations and armed personnel, searching for a solution to the disaster in abandoned factories, laboratories and other places.
In the end, they successfully produced the virus serum and spread it, bringing hope to the world.