Mother and son who got separated from adoption, decided to live together for the first time in 40 years. This is because his mother is about to die. While his natural appearance and personality are exactly the same, everything else is completely different. In fact, they are foreigners to each other. However, to compensate for the time they lived apart, he goes back to his childhood. On the other hand, resentment towards each other grows because of the pain engraved in each other's hearts. It is uncertain how much time is left between the two, but there are still a lot of things to do while they're together.