Hou Sai Lei reappeared at the door after some time, and nodded to Shi Mu.
Shi Mu understood his signal. Then, his body moved and followed Hou Sai Lei.
Shi Mu soon found himself in a room with relatively simple decoration.
A white-faced middle-aged man was seated on a sandalwood chair. He was clad in a grey robe. His eyes swept over Shi Mu. Then, his gaze returned to Hou Sai Lei who stood beside Shi Mu.
Note: the Trigrams have 8 symbols in Taoist cosmology. The book that Shi Mu has procured corresponds to the Symbol of Heaven.