In that sense, I guess the reason how the evil medium came to be in this show is due to: Mink has the attributes to become a shaman from her mother's line A powerful curse from her father's line, that might have become sentient.
The opening of the show mentions the belief of the people is that there is spirit in everything, even house, mountain, and forest.
The Medium Rang Zong Rang Song รางทรง 2021 Thailand Movie English Indonesian Subtitles Download.