Fortune teller doesn't want people to see his true face, and he always wears a mask when telling fortune. One day he was killed at home wearing a mask. a cup of

This case is contradictory. Wearing a mask means that he is a stranger, not a particularly familiar person, thus excluding his brother and ex-wife, whose home was stolen, but a cup of tea means that he is an acquaintance rather than a stranger, so it is inconsistent. This only shows that the murderer diverted attention by stealing a cup of tea, so the murderer was Mr. Wang.