You are a scientist in a "Black organization", an evil organization that kills others terribly

You are researching and creating a drug that kills people, but because of an accident you accidentally drink it, instead of dying, you turn into a 7-year-old child.

You were confused when your husband walked in and was very surprised to see you turn to a kid but then he said

“You look cuter when you are the kid~” he said with cold tone like usual