Who Is Zombie takes the gamer to a post-apocalyptic world where a zombie virus has broken out across the planet. Infected people and animals turn into the walking dead, wanting only fresh blood and brains. The action takes place in 2033, when, due to a failed laboratory experiment, more than half of the planet is on the verge of extinction. The player will play the role of a survivor who will have to fight enemies and hold out as long as possible.

The main task in Who Is Zombie is to prevent the dead from entering the shelter where civilians are hiding. To do this, you will need to obtain weapons, build defensive structures and recruit partners who can prove themselves in battle. The government has assigned an inspector to each civilian shelter, and the user takes control of one of them. These people need to talk with refugees, weed out infected people and protect the territory.

The central character is Inspector Aiden, who will need to establish relationships with different people, examine each survivor and improve the shelter. The passage is based on the gamer's choices. Each decision has its own consequences and features of the further development of the plot. There are 9 endings, which are determined by the 30-day adventure. The ending of the plot can be either happy or sad.