she can see ghosts/spirits from the time she was a kiddo, and some old lady in miko kimono*just search it, u will know gave her that necklace/amulet, that protect her from being possesed
The Director (ML) have big problem with sleep (insomniabecc of that evil spirit), but when he brought drunk MC home(and she hugged him in her sleep so he could not escape >:3 he was able to fall asleep 1st time in a while
At the 2nd time they sleep (it was Director that asked her for it so he could sleep) he was possesed and whanted to do MC, but she quickly realized it is not Director and that she does not have her amulet, so the possesed person & spirits can touch her (tbh she can also be possesed by them without the amulet, as u saw in ch 4)
The spirit that possesed her dissapeared becc it does not feel horny w/out her showing her femininity, so it =poof= dissapeared, and the Director does not remember anything ..but his stomach hurt, becc she kicked him, and he have swollen bump at the back of his head..
At the 3rd time ಡ ͜ ʖ ಡ she gave him her amulet so he could not get possesed, but MC forgot (or didn't know that the spirit can also posses her) she can also be possesed
Edit. I forgot to mention that, according to MTL, she is in love with him, but MTL might be mistaken, and it could be that she just feel respect to him or she admire him :/