At some point in their lives, Everyone has to walk through a tunnel of darkness in their life. And if someone is blocking your way, it's not your fault if you take time to find the way out and reach the other end of the tunnel.
And honestly, well earned because Ki Joo is honestly in a horrifying situation and has been living in it since birth and yet he is such a decent, kind person - he's had every excuse to go psycho and he has not.
Oh man, the look on Seo Ki Joo's face when she starts patting his head and telling him he did a good job. It's the same look he had when she joined him for lunch. Small things for others but for a dude whose only companions have been ghosts for most of his life her little acts mean so much.