[I'm just gonna point this out, the letter is in the form of Joon before having his memory taken away, it was written to Taemin beforehand since he had seen the future of Taemin and Jaejoong and he saw Jaejoong's decision of choosing Yunho instead.]

To Taemin,

I honestly don't have words for anything..I'm currently writing this to you because I've seen things I never wanted to see come from you again.Anger,frustration,regret.. Things I saw from you that broke you down but I got back up. Probably by the time you're reading this, I don't remember who you are, nor do I know why I don't.. but know somewhere in me..there's always you. we had our fights, we tried our best to resolve it.. but please don't think I don't love you because I do. I understand your situation just as much as anything now through what I've seen and I'm sorry for all the things I've said. I guess seeing you have those feelings towards another person just..got to me ya know? so we're in the same position now. I'm no brag nor am I writing this to make you feel any hurt..I'm writing this because I want you to know no matter what you've been through,I'm willing to be there for you,friend wise, or dating wise..or even as a stranger. I'm here..

I always am...

Sincerely that pabo,

Joon.

He set the letter secretly inside of one of Taemin's books and headed out back to hang out with some of his other friends for a while before he sent the text...