After a disaster called "Grey Fog" swept across the world, civilized order disappeared. Most humans have been transformed into monsters - "sound followers" who only respond to sound and heat. Cheng Zhixing, a former member of the rescue team, struggled to survive alone in this dead wasteland. He had only one goal: to reach the legendary last refuge, the "Ark" on the eastern coast. By chance, he rescued a taciturn girl from the Sound Followers, who seemed to hide secrets about the "grey fog" and the future. With this mysterious oil bottle, Cheng Zhixing had to re-examine his own path of survival, and also embarked on a dangerous journey to uncover the truth of the apocalypse.
