@starburst98 Not really a psychopath. Someone who doesn't have any emotions would probably not always be gloomy and edgy. She probably just does what she's supposed to without ever getting angry or sad or happy. Like a robot, or like in that manga about clones "Number Girl". They are more or less emotionless there (although they do start to gain emotions) so just imagine them but with a harmless smile on their faces...ok, that sounds creepy. Anyway a lot of people, like me, always tend to smile when I'm not conscious about it. I don't need to be happy or anything, my mouth just naturally forms a smile.
Edit: Ok, the bonus chapter explains why she can't see her emotions. Seems like it's none of this. lol