There Is Something Wrong with This World, There Is Really Xuanmen Feng Shui

My name is Li Xuan, an ordinary materialistic college student. My life goals are to graduate, work, get married and have children. Until my impossibly beautiful drama club senior played a zombie in front of me for a prank, and I saw with my own eyes that another "real" one followed behind her. From that day on, my world went completely wrong. The usually lively and charming senior sister can command corpses; her cold and fairy-like cousin can raise her hand and create a thunderbolt in the palm of her hand. They said that somewhere I can't see, there is a hidden world composed of Taoism, secret techniques, and strange doors. And I, an ordinary person, am born with the ability to see the "door" that divides the two worlds. I thought all of this was a nightmare, until a phone call from my hometown pointed all the clues to my kind and kind grandmother who had never left the town in her life... How many secrets are hidden in this world? And my grandma, who is she?