Okay this sucks but I have been working on it since yesterday morning so if this flop istg.
Au: basically Finn never really liked his life. While he grew up he started hearing more and more voices in his head & after the lose of his best friend he couldn’t take it anymore and let the voices in his head take over his body. But while the time that went by he started wishing he never gave up his body to them but it was already to late..
&& he wasn’t able to fix anything what they’ve done.