HELP!!

what was that manhwa again where the girl was branded as a witch and she killed her husband and so she is shipped into a prison right (most of the story happened inside a ship ) and the prison guard /head or whatever that handles her transfer is some sort of war hero and he is strict and doing his job but at sime point the fl finds a child saves her life and the child is so friendly to her and so is the child's grandpa but the guy is still suspicious about her