One’s in love, the other’s unhinged

So I found the raws, and I’m a bit confused, mainly because the fan translations don’t make much sense. But I don’t think it’s outright rejection. It feels more like they have completely different definitions of love.

On their last date, Taeyoon kept trying to confess. When he finally sort of did, the response wasn’t what he expected. While Taeyoon wanted a normal relationship, Jaemin wanted something else entirely, he wants Taeyoon to suffer for him, the way he suffered because of Taeyoon’s actions in the past. He wants Taeyoon’s mind consumed by him.

To me, this doesn’t feel like rejection, just a seriously messed up version of love. Anyway, does anyone know if this is based on a novel? Please drop the title if you do.