"It's from Hakyeon hyung. It was a letter addressed to us before he.... died."

Kyung wishes that he would stop being vain. He wishes that he would stop over-reacting and act like a normal person. 

Even if Jiho is a huge , he's glad someone still likes him. Even though he doesn't show it, Jiho values the love letters from his secret admirer, and looks forward to getting them in his locker every morning.

"It is sad not to love, but it is much sadder not to be able to love." -Miguel de Unamuno

She tortures him. She makes his life a living hell, and loves seeing him in pain, but no matter how hard he tries, why can't he seem to get away from her? 

Hakyeon hates his skin. He hates his forehead. He’s always had a complex with how he looks.