Tak Dong Kyung has been working hard ever since her parents passed away. Her life seemed more stable after working as an web novel editor for 6 years, but then she gets diagnosed with a brain cancer. She blames her unlucky life and wishes to curse everything to disappear, which unintentionally calls Myeol Mang, a messenger between humans and gods, to appear. He says that he can grant her wishes. As her last hope, she makes a contract with Myeol Mang for a hundred days to live how she wants, risking her everything.