Who is the mysterious man in 404? _1

The next day they returned home early in the morning. As it was the weekend, both kids stayed home!

The kids were quite critical of their parents' behavior the previous evening, expressing dissatisfaction towards their parents for not having returned home and for going out to have fun without them.

Lin Haoran was quite straightforward, and asked sharply, "Why were you both out having a blast while my sister and I were left at home? Do you realize how wrong that was? That's age discrimination, which is a serious issue. Racism and sexism are continuously being fought against, and here you are introducing age discrimination. This is sure to shock the world. Mom, Dad, aren't you afraid of being criticized by the international community? Of numerous children rallying and protesting at our front door? Mom, Dad, don't you think you should consider how to make it up to me and Sis?"