Mina, a housewife happily living with her husband and father-in-law, had a secret. Mina, who harbors feelings for her father-in-law while hiding it from her husband, was also providing "sexual care" while caring for her father-in-law. However, one day, when Mina was absent, her father-in-law was injured, and her husband decided to suddenly have her father-in-law enter a facility. There are only 4 days left for the two of them until admission. Mina and her father-in-law's actions cross a line and develop into a passionate affair where they yearn for each other...