You guys should notice the difference between his reaction. He just quite when he's with Jeannete, but when with Athy he's concern. He even thought how athy can manage to get a bowl of porridge!! His fatherly side is still there even though his memory don't.
HE TREAT JEANNETE ONLY FOR CURE TO HIS HEADACHE. I REPEAT: ONLY FOR A CURE FOR HIS HEADACHE!!! NOTHING MORE
I read this again from the beginning to grasp out the timeline that's a bit confusing. Aaaaand, It had me wonder,, what if the reason that Yeoryoung (female) always fought Ji-Ho (white haired) because she knew that he actually likes Dan-I (MC)?? I mean every time he tried to interact with Dan-I, she she will butt in. And it's clearly not because she likes Ji-Ho (i mean we know that she adores Dan-I so much) ╮( ̄▽ ̄)╭
Maybe that ghost is Matthew? They're hiding In 2nd floor and switching identity every now and then? Ugh i don't know anymore.. Poor William though