After being laid off, Ji-won, an outsourced sanitation worker in a provincial town, seeks reinstatement but is met with indifference. When he uncovers a secret about his coworker Jun-seo, he confronts the supervisor who pushed him out, demanding an apology. That night, an accident forces him to choose between truth and survival.

Da-bin, who dreams of a normal high school life, helps his younger sister Eun-seo, who is deaf in one ear, get to and from school every day. When he learns that his family may have to move far away for Eun-seo, he applies for an exchange program, hoping to take one last trip with his girlfriend. But when he starts working at a motel to cover the costs, he finds himself drifting further away from his plan.

Gun-woo, drowning in a failing business, meets Yo-sup, a mysterious boy who lives in dreams, and glimpses a future that lets him win big on a sports bet. While searching for Yo-sup again, he crosses paths with Min-a, a guarded high school girl. Struggling to understand one another, the three are drawn into a strange journey shaped by dreams and fate.

At 4:30 AM, Mom is preparing for a huge meal all by herself. In charge of the eatery at the construction site of the Incheon Airport Terminal 2, Mom easily makes a meal for hundreds of construction workers, but her labor is not easy to watch for her filmmaker son.

After the premature death of her son, Jung-sook learns to read and write by transcribing her late son's anthology, Passing Over the Hill. In search of her son's remnants, Jung-sook visits his university in Seoul and encounters the people who remember him. She wants to find her son's hill.