Do-woon, orphaned and raised by a priest, is ordained as a priest. In the confessional, he hears that his mother was murdered and an evil group reveals itself.

About the events that unfold after longtime job seeker Seok Hwan discovers that he has the ability to resurrect three days after his death. Seok Hwan is full of justice and he has no patience with injustice. Due to his fiery personality, he has been unemployed since he graduated from college. He doesn't have a dream or hope. He is all by himself, since his father died when he was a child. One day, Seok Hwan sees loan sharks harassing high school student Ye Rin, who lives next to him. The loan sharks are looking for Ye Rin’s father. Seok Hwan fights the loan sharks and he is killed by them. 3 days later, Seok Hwan wakes up in his apartment. He is alive again. Seok Hwan realizes that he wakes up 3 days after his death, no matter what. Using his special ability, he fights against evil.

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.

Han Jung-woo, a pilot with top-class skills, is flying high and even appears on a famous TV show. But everything comes crashing down when a careless mistake causes him to lose everything, even his job. Blacklisted in the industry, no airline is willing to hire him. Desperate with no other choice, Han Jung-woo transforms completely into his younger sister's identity and succeeds in landing a job as a pilot.

Kang Woo-ram is busy preparing to get a job. Lee Hyun-ji is a would-be anchor, but she works at a homemade hamburger restaurant. One night, Woo-ram visits the hamburger restaurant and orders a double patty hamburger, which has a "buy one, get one free" sale. This is how their relationship begins.

Six finalists for a global IT job are pushed into a tense team debate where only one can win, exposing their true selves under pressure. Among them is Jeon Yo-han, a brilliant but emotionally detached engineer who relies solely on logic.