well, you learn something new every day
It's cool. You aren't totally in the wrong, actually. The UNSC is the UN body that can set sanctions, and right now the DPRK isn't one of the elected non-permanent members.
However, it's not like they're being poorly represented. China is the DPRK's strongest ally, plus China has veto power in the Security Council as a P5 member. If these sanctions were even slightly unreasonable, China would have veto'd the stuff out of them.