Well, just spinning a story here, but as I understand it North Korea threatened to sabotage South Korea's nuclear power plants. Around that time Obama stopped to have some conversation with some Chinese diplomats....perhaps about Korean relations? And soon thereafter North Korea got blamed quite publicly for a hack that may have been detected a bit before it was made public. Now North Korea's internet connections are sabotaged to keep them from intruding into South Korea's power plants, with China standing mum and not protesting, but the story about why this is going on has to do with this silly movie.
OK, it's just a story. But AFAIKT it is consistent with everything that happened.