Responses
Do you want to know why? It's in the novel, you'll have to use a translation app.
https://www.52shuku.net/xiandaidushi/pm/h2Fs.html
I think it's also in the up to date ones here
https://www.mangago.me/read-manga/the_substitute_relationship/
I wonder if the reason he covered his eyes wasn’t because of his eyes but the mole because it reminded him of his mother. And the picture album he kept looking at was pictures of his mother. This is the only plot twist I’m willing to accept.