In recent years, with economic development, the number of people from our country going abroad has been increasing daily. Coupled with various tourism activities, many people have ventured outside the "wall". Some are compelled to make a living, while others have earned enough to leave comfortably. As people become more familiar with each other, it becomes easier to take action. Moreover, without the protection of a "world police" role that advocates for individuals, the situation has gradually evolved into what it is today.