The reason why Mu Ziying was so afraid of Nangong Yun coming to train them was because she had suffered too much under her in the past.
Nangong Yun was notoriously strict.
Although she was generally kind in her daily interactions, when she got serious, her cold and ruthless demeanor was simply unbearable.
When Elder Brother and Brother trained her and Mu Ziqing, at least, they would consider their gender.
Some high-difficulty tasks would generally be slightly relaxed.
But it's different with Nangong Yun, when training them, all four had the same tasks.
Whatever Elder Brother and Brother were training on, they had to follow.
Sometimes they had to climb steep cliffs, and they could only grit their teeth and climb.
Three years ago, Mu Ziqing even fell off a cliff and broke her leg.
Perhaps being strict is a good thing, but being too strict is not.
There are always some physical differences between men and women, why torture them like this?