Kim Dok-ja, an ordinary man in his 20s, is the only reader of an obscure web novel titled "Three Ways to Survive the Apocalypse". After having read the last chapter, the novel suddenly becomes reality, and its omnipotent hero Yu Jung-hyeok appears before Kim. As the only person who knows how to survive in this world, Kim and his companions strive to save the world by writing his own, new ending.
Ahn Hyo-seop
as Kim Dok-ja
Lee Min-ho
as Yu Jung-hyeok
Chae Soo-bin
as Yu Sang-ah
Shin Seung-ho
as Lee Hyeon-seong
Nana
as Jeong Hee-won
JISOO
as Lee Ji-hye
Park Ho-san
as Gong Pil-du
Choi Young-jun
as Han Myeong-oh
Jung Sung-il
as Cheon In-ho
Cho Hyun-jung
as Bihyeong (voice)