SEOUL—Newly posted images showed North Korean leader Kim Jong Un smiling and strolling all around a manufacturing unit Friday, ending a nearly 3-7 days absence from general public look at that fueled rumors of his dying.

With balloons introduced to the skies, Mr. Kim, carrying an all-black outfit but no facial area mask, was revealed reducing a purple ribbon at a fertilizer manufacturing unit. He was flanked by aides, which includes his sister, Kim Yo Jong. Hundreds cheered him on. Mr. Kim, 36, sat on a podium in entrance of a large signal that outlined the factory’s identify and date:…