An asteroid is on course to crash into Earth in 200 days and destroy the planet. The world soon learns of the news and falls into chaos. Jin Se Kyung works as a middle-school teacher in Woongchun City. She learns about the impending end of the world. She decides to quit her job and do volunteer work at a child and youth division in city hall. She struggles to save children in danger. Her boyfriend of many years is Ha Yoon Sang. He currently works as a researcher at a biotechnology research institute in the United States. After news of the end of the world is released, he flies back to South Korea to be with Jin Se Kyung.