Who got the remaining 0.07% votes in N Korea as Kim Jong-un's party wins 99.93% of votes?

North Korean leader Kim Jong-un's Workers' Party of Korea and allied groups got 99.93% of votes in latest parliamentary election. There were no opposition candidates. In each constituency, voters were given just one pre-approved candidate to either accept or reject. This means remaining 0.07% didn't go to rival party or leader. Instead, it represents voters who chose to vote 'no'.