After reading the novel and rereading this, I'm sad that
Spoiler!
we never actually got to see rest stop 4. It would have been fun to see them all in an amusement park setting for a bit, especially if it's after You Huo and Qin Jiu get together. We all know they wouldn't have had a normal amusement park date, but I can still picture some cute and funny moments between them in that kind of setting.
I don't want to spoil the story (unless you want me to), but it has nothing to do with passing the examination or not. As is mentioned in this chapter, the rest stops are usually randomized and can't be chosen, and so the characters are never actually sent to rest stop 4 in the story (but they do visit the other ones).
