Tak Dong Kyung has been buckling down since the time her folks died. Her life appeared to be more steady subsequent to filling in as a web novel editorial manager for a very long time, yet then she gets determined to have a mind disease. She faults her unfortunate life and wishes to revile everything to vanish, which accidentally calls Myeol Mang, a courier among people and divine beings, to show up. He says that he can allow her desires. As her last expectation, she makes an agreement with Myeol Mang for 100 days to live how she needs, taking a chance with her beginning and end.