My wife, who had been using a flip phone until recently, finally switched to a smartphone. She didn't really want to change the model, saying, ``I'll only be communicating with you anyway...'' However, as soon as she changed to her smartphone, her wife became addicted to it. She thought it was just the beginning, but she... she never let go of him for a second, and she thought something was suspicious. I didn't want to suspect my wife, but I found some traces of deleted messages in her exchanges, so I decided to ask an acquaintance who is familiar with smartphones to restore the messages. Then her wife was having an affair. Moreover, her partner was my classmate.