Tak Dong-kyung finds out she is dying from glioblastoma and has only three months to live and learns that her boyfriend is a father-to-be and has a wife. She makes a wish for the world to end. Her wish is heard by Myul Mang, Doom personified, responsible for every death, calamity or misfortune in the world. On his birthday, he gets to choose a human's wish to fulfill. Sick of his fate, he chooses to fulfill Dong-kyung's wish to end the world.