During my son's business trip, he had sex with his son's wife for four days

It's been a year since I married my son. Nozomi was heartbroken by how her husband, who was so kind before marriage, became colder day by day. Then, a man watches Nozomi's situation with a worrying expression on her face... That's his father-in-law, Ryoichiro. She felt sorry for Nozomi, but she was heartbroken because she couldn't say anything to Yoshio. One day, Yoshio went on a business trip. Ryoichiro treats Nozomi, who is left alone in the house, with kind words...