A schoolboy Van Doyong and a head chef Lee Minsok receive a unique offer from the mysterious Kumiho: to return to life for 49 days after death, by exchanging just a drop of blood. However, the terms of the deal turn out to be more complicated than they seem. The heroes face a difficult choice, but one of them is ready to do anything to correct the mistakes of the past and return to life. This touching story reminds us how important it is to value every moment of life and to be grateful even for small things.