Dong Kyung has been working hard ever since her parents passed away. Her life seems to get secure after working as a web novel editor for 6 years, yet eventually she gets detected with a brain cancer. She blames her unfortunate life and also desires to curse everything to go away, which accidentally calls Myul Mang, a carrier in between humans as well as gods, to show up. He claims that he can provide her desires. As her last resort, she makes an agreement with Myul Mang for hundred days to live as just how she wants, risking her everything.