Who is the grandmother who has been circling behind the door in the thatched cottage that Yan loves to live in "Hell Girl"?

Grandma, who lives with Yan, can only hear the sound and shadow of the loom. The original shape is unknown. But when rice and fireflies rushed into the house and saw her appearance, they screamed and ran away. Constantly operating the loom, I only talk to love at ordinary times. In the first season, I talked to people outside of love for the first time (that is, Chai Tian and me). In the second cage, I stopped going into her room and tried to reach into the chrysanthemum of the loom. Because I mistakenly thought that the rice I accidentally bumped into fell in love with fireflies, I also had a few words with her. When love is leaving, it will remind love that the robe is put away. The last episode of Erlong sent a message of love and gratitude to Sanqiu.