Yoon Da-mi, a woman whose 10 years of life disappeared overnight, it all started when she got involved with a man named Shin. However, Shin ignores Da-mi, saying that it has nothing to do with him. Then, when he finds out about the existence of an 'object' that he had been searching for for a long time in Da-mi's house, his relationship with Da-mi begins to change. But can he fix a relationship that has already gone as wrong as it could?