beta
I think it doesn't really matter who Rou or Sou is at the end. Instead, it seems to me that the FL was already far too paranoid to decipher and decide with a clear head. And even then, I doubt there is even a "kind twin" to begin with. Mind you, we got that info from the "kind twin" and with no actual way of verifying his claims. Both of them were involved in a long con, and if we believe "Sou's" confession, one was abusive while the other just sat idly by. We can talk about which twin is which all day, but one thing's for sure, she cannot trust any of them now.
Also this is just a nitpick but the FL chose one of the most ineffience and riskiest method of murder lol.