The Great Celestial Master

He was chosen by his master to be the next successor, but his most trusted junior sister plotted to take his place. Severely wounded, he could only disguise himself as a fortune teller to keep a low profile. Hiding his identity, he seemed useless on the surface, so his father-in-law wanted to depose him and let his daughter marry someone else. He even sensed his wife's inner anxiety and hesitation. What should he do?