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One day, a fog spread around the world. And in the mist, monsters began to appear. Doha Yeon quietly looked at the man in front of her. Neatly trimmed black hair, a cold, urban impression. The suit he was wearing matched horribly well, just like what he imagined a few years ago would look like when he went out into society. However, in a reality different from that imagined, the tip of the muzzle pointed towards his chest. "Smile." “I have a bad habit of talking to a senior I haven’t seen in a long time.” “Laugh before you shoot.”
A thick layer of mist shrouds the world and turns people into zombie-like monsters. Without knowing its cause or the solution, the only way out is to sneak into the capital city built for the privileged. While struggling for survival, Hayeon, a talented biologist, finds out that his crush Myung Woon has something to do with the virus...