ironphilosopherbread:

I have a feeling Sangwoo’s hallucinations are getting worse.
Just look:

First Yoon Bum says he nerver said those words. Than:

Then it looks like he does not rember conversation about pet names.

And now we have this and I believe Bum is not lying.

I bet Sangwoo only imagined those conversations.

Maybe he only had them with his mother in reality when she was still alive.