Seán William McLoughlin, a bullied 17 year old highschooler, is secretly a popular youtuber. No one has seen his face, only his voice (like Cryaotic only no one has had any description of him). No one really knows him, but they also do. They know the real him, not the one behind the 'mask'.
Mark Edward Fischbach, who is known as Markiplier by everyone (cause he has a facecam so of course everyone knows him), goes to the same school as Seán but he doesn't know Seán even exists. No one does. That is, until he makes himself known to a certain black haired (with red dye in it) 'gorgeous' man after showing him his most well kept secret, the face of Jacksepticeye.