Does Shin-ah know how to read?
I thought about it, and I think that Shin-ah is the only one in the group who probably doesn’t know how to read. One doesn’t do much reading while living under a
rock cave, right? So during the times when the group is resting I’d like to think that Yun teaches him and everyone gradually becomes quiet to hear Shin-ah read aloud. Eventually all of them can take turns reading with him (because Yun needs time to prep and cook their meals,) helping him with how to read the words he gets stuck on.
There would be one time when Jae-ha is bad, bad boy and tries to remove Shin-ah’s mask while he is focused with reading. Shin-ah stops reading with Jae-ha for awhile because of that until he is the only available option because everyone else is busy. Since Shin-ah is wary of Jae-ha, he holds onto his mask. He becomes conflicted because he can’t hold onto his mask and turn the page, but luckily Ao pops up and does it for him (●ºωº●)