The 3 uncles in the movie are lucky to have nieces who are not only talented and beautiful, but also understand their psychology very well - the psychology of men who do not have wives and children. Talking about it, I found out that the granddaughter who was still asking for her uncle to be carried has now become a young woman standing in front of her. However, even though she has grown up, her granddaughter's personality in the past has not changed much, she still shyly asks to sit on her lap and jump around as if she is riding a horse. As for a slight change in personality, the older she gets, the more mature she becomes, which means that thinking about physiological and sexual needs also begins to develop. This has made the act of "jumping on the thigh" no longer described as innocent as before, instead it is a stimulating and imaginary scene of having sex with the uncle of this lewd schoolgirl. This also made him very uncomfortable, unable to control himself when his grandson did so, leading to a clumsy incest that took place just before the reunion meal.