This paper aims to investigate how player's identity is built by analyzing post-apocalyptic games. The post-apocalyptic game is the game which is set in a virtual world after catastrophe. This study analyzes the settings, characters, and a narrative structure of the post-apocalyptic games. As the result, post-apocalyptic games establish the existential identity of the player. The post-apocalyptic game is a kind of realism text which precisely reflect real world, and the player could find out his identity in games as a Homo sacer which is the mixture that consists of a non-hero persona in the game and a safe person in reality. Post-apocalyptic games can be alternative media which help the player experience existential discourse in real world in 21st century.