Answer: Fu Cha (the last monarch of Wu in the Spring and Autumn Period).
Analysis:
The mysterious wife is in charge, which can be understood as sending her husband and simplified into two words.
In turn, Fu tea is the answer.
The riddle is a swinging grid. That is, the answer defines the word with two words, which move back and forth and then buckle the puzzle.
Therefore, the answer to the riddle of "Fu Tea" is Fu Cha, which happens to be a riddle.