On a sudden whim in childhood, his younger brother (Su Beizhu) proposed to exchange his expertise with his older sister (Su Beilan).
"For example, I am good at A and you are good at B. To the outside world, we pretend that you are good at A and I am good at B."
Su Beilan readily accepted the offer. Rather than pretending to be a pig and eating a tiger, she preferred to pretend to be another tiger.
Many years later, Su Beizhu became a famous general, and Su Beilan became a commander with both wisdom and courage. It's just that the general has never been tricked by conspiracies, and the commander has never been successfully assassinated.
In this regard, people have said: "Fools are blessed" and "Wisdom can crush force."