At around 2:53 into episode 8 when Khen was flashing back to when the house wouldn't let him go with Toh and Bing,…
what i understood, 3 timelines here, khen present, mas past, and female ghost even further past, mas as main person who can see ghosts, all linked to the house, khen died and went to past and met mas, female ghost died, and guess buried nearby the house also found khen and asked him to tell mas to help her, only mas is not ghost here (in his time)