Tak Dong Kyung is an editor for a web novel company. She has led a tumultuous life, subject to the whims of fate, and she soon finds herself on the precipice of true destruction. Myeol Mang, the existence of a middle manager between God and humans, suddenly appears in her ordinary life. He was born between the dark and the light: when he breathes, countries disappear; where he walks, the season’s collapse; when he smiles, life is extinguished. All he has to do is exist for something to fall into ruin. This is not his intention, but simply his fate.
Dong Kyung makes a 100-day contract with him, risking her life and her love. Myeol Mang eventually forms a relationship with her, who curses the whole world, as she drags him into her life with her fierce desire to live.