Ángel is the new member of a company whose mission is to sift through all types of information on the Internet in order to make it a safer place. Berta, his partner and instructor, teaches him the ins and outs of his new job, involving all kinds of images, false information and even videos that Ángel would never have imagined seeing. All this, accompanied by an incessant hum, makes him reconsider the fact that this job is not for everyone.