This spring, when my daughter started kindergarten, my wife started working part-time at a precision equipment factory in the city... Until then, she had always stayed at home raising the children, so I thought it was a good thing for her to start working part-time, as it would help the household finances, and I watched over her with a smile. However, recently, it seems that my wife has been inviting a part-time worker, a man around 20 years old who says he is a colleague from her part-time workplace, to come over to our house every now and then after work and have a chat with him...