One peaceful and quiet summer day, the actress's cat disappears from the pension, and the owner of the pension and her son Seong Jong struggled to find the missing cat. It is a pension where the last energy of autumn passes. Comedian Sang Hoon, who comes there remembers the trip he took with his mother, and is burdened by the people who ask him to be funny wherever he goes. By the end of his last trip with his mother who can no longer be with him, Sang Hoon finally laughed. A man whose ID is 'mother' and a woman whose ID is 'son' meet in a quiet winter's pension to spend the end of their lives together. A woman who doesn't seem to want to die makes men confused, and their last day has an unexpected development...