I don 't think they're terrified, I think they're so happy about meeting their leader that they're crying.It would be really an honour to have the Supreme Chairmen of your country suddenly knock on your door and offer to take a picture.
Where did you hear that? There were also other party leaders. And you don't actually write the name of the candidate on your paper. Instead, you have papers with the names of all the candidates and you can either approve or disapprove them. And not all North Koreans approved Kim Jong-un.