Because they are mostly being showed propaganda promoting the personality of Kim Jong. And he doesn’t want them knowing the truth about him
The Senate "cools" legislation from the house like a saucer cools coffee. The Senate approves all presidential appointments and ratifies treaties while the house initiates revenue bills.
The Senate has vital powers as stipulated in the constitution under the " advice and consent" provisions, Article II, section 2, to; ratify treaties which require a two-thirds majority of the senators present and a simple majority to approve important public appointments i.e., ambassador and cabinet members.