In a comfortable environment, people are easily confused by the surrounding environment, which eventually leads to depression, indulgence and degeneration. Because this process is changing bit by bit, people have completed the whole transformation in a subtle way, but it is too late to wake up. On the contrary, if people are suddenly thrown from "heaven" to "hell", because of the huge gap, people's reaction is also very strong, so as to make a quick choice so as not to know how they died in the end.