I wonder if the setup here is that Haejoon is trying to go back into the dorm since he sleeps better there. But I find it cute that he's helping Eunyung even if the latter is probably going to suffer through some strict teaching methods.
looks like Haejoon is more terrifying than the ghosts xD
but he can finally reunite with Miyung and they can spend more time together, thats good in my books <3