I think it should be. First of all, Guli said that she would come back once a year, which may mean that the deceased would come back once a year on the anniversary of her death. Secondly, except for Lin Xiao, the other three sisters are all dressed in white, which corresponds to the end of the three sisters being burned to death in the house. However, when the three sisters were noisy in the room and Lin Xiao didn't say a word, the last point was that when the three sisters urged Lin Xiao to hurry up, Lin Xiao, who had been silent, said something that might mean suicide. For Lin Xiao who lost his most important friend and lover.