In the apocalypse, in order to study the key to suppressing zombie viruses, many private research institutes like "Blue Houses" were quietly built. Keyun grew up in the research institute and was the first experimental subject made by his biological father Kean. By chance, Keyun accidentally saw a child like himself being bitten to death by zombies. In order to escape, he accidentally discovered Kean's diary and learned the truth. Later, he escaped from the research institute with the help of Kean's student Qi Cheng and strayed into a remote town. The stories of the survivors in the small town made Keyun aware of the cruelty and terror of zombies and the complexity of human nature. Keyun has a special physique that attracts zombies, and ultimately sacrifices himself to protect the people in the small town from safely evacuating.
