Goodbye Earth

The government announces the asteroid's approach and imposes martial law nationwide. Wealthy citizens flee to supposed safe zones while the rest brace for shortages and rising despair. The stage is set for Woongcheon's residents to endure the countdown.

Jin Se-kyeong volunteers at city hall, while Dr. Ha Yun-sang, her fiancé, is stranded in the US. Captain Kang In-a leads a unit trying to maintain order, and Father Woo Sung-jae takes charge of the parish as the priest disappears. The four friends face the new normal together, each coping in their own way.

Se-kyeong learns about a ring run by escaped convicts that kidnaps children and is linked to the deaths of many of her former students. The discovery reveals a web of criminal networks poisoning the city. She resolves to confront the danger despite the deteriorating conditions around her.

Captain In-a's probe uncovers that the convicts' trafficking ring colludes with discharged soldiers to run gambling dens and brothels. The network extends into the city’s underworld, signaling a coordinated threat. Her findings deepen the link between crime and the elitist group behind the escape plan.

The crime rings are shown to be connected to a cult-like elitist group financing their flight to another country. The group's wealth and secrecy suggest a final gambit to outrun the asteroid. The community's safety hinges on uncovering and stopping this scheme.

Father Woo Sung-jae learns that his superior, Father Baek, is part of the elitist group and has absconded with church funds. The revelation shakes his faith and calls into question the church's role in the crisis. He must decide where his loyalties lie: faith, community, or truth.

As a geneticist whose research could secure humanity's post-asteroid future, Yun-sang is offered a place in the elitist scheme. He refuses to leave Woongcheon without Se-kyeong, who herself refuses to abandon her former students. Their moral dilemma underscores the story's central tension.

The elitist group arranges two planes to evacuate its members from South Korea, presenting one last chance to escape before the asteroid arrives. Se-kyeong, Yun-sang, and Sung-jae attempt to secure safe passage for the children, hoping to save the vulnerable. Negotiations reveal the moral conflict and risk at stake.

Se-kyeong, Yun-sang, and Sung-jae fail to persuade the group to let the children board the planes. The attempt exposes the elitist group's resolve, revealing how far they will go to secure their escape. The fate of the children hangs in the balance as the countdown continues.

Protests on the emergency landing strip prevent the first plane from landing, amplifying the chaos. The second plane en route crashes, killing everyone aboard. The city mourns as the deadline for impact looms closer.

Se-kyeong and Yun-sang marry in a quiet ceremony as the end nears. Yun-sang launches a memorial project to document Woongcheon and its residents for future visitors. In-a is discharged from the army and begins a life on her own, while Sung-jae leaves the priesthood but remains devoted to the community.

Haunted by the loss of her students and the renewed trafficking, Se-kyeong resolves to act. She heads to the criminals' gambling den with a gun to eliminate the trafficking operation, risking her life in a final stand against the culprits. The act underscores her uncompromising commitment to the children and the community.