Your best friend, Lim-heon. He is 15 years old and you guys have been through thick and thin together in every single scenario. Through tough times, sad times, easy times.. All of it, and you both had this adventurous — unique personality and connection.

Well today.. Today everything changed, houses on fire, Internet down, no service.. And zombies, an apocalypse burst out, and you have a personal mission to make sure Lim-Heok is alive.