Okay, so I don't know why, but it just popped into my head. I read this fic a long time ago. It was a sort of 2min fic. Minho and Taemin were dating but Minho was starting to have feelings for Key (I really hate Minkey.....). Anyway, Taemin started getting jealous and overly possessive I guess you could say? So Minho started to hate him. However, one day, Key was found dead and Taemin had come by to Minho's house, seemingly completely unaffected by the news. Minho began to believe that Taemin was the killed and then killed Taemin himself by beating him to death.

The twist is though, that because of his guilt, Minho was slowing going crazy and he was imagining Taemin going crazy with jealousy. Key had actually been killed by a robber that was in his house, and when Taemin went to Minho's house, he went there to comfort Minho. However, Minho had already gone crazy from the guilt, and instead of seeing Taemin comforting him, what he saw was Taemin teasing him about Key's death, which made him kill Taemin. He ran out of the house, where he found out the truth from the police, and felt even more guilty for killing Taemin when Taemin hadn't done anything wrong. The whole time, it was Minho himself who was going crazy.

I don't remember the exact end of the fic, so I don't remember if Minho was arrested or not. But I can't remember the name of the fic, and I really want to read it again because I just randomly thought of it and it got stuck in my head. 

So if you know which fic I'm talking about, please tell me?