Beauty with purpose

There was one word An Xiulan could use to describe her teacher. 

Cruelly perfectionist. 

She didn't know if the word existed or not. But she would like to submit a petition of the word if it didn't, to add it to the dictionary. 

It had been three days since Mr Yun started his lessons. And all they could say was that she was dying. Her legs were sore. Her body was aching all over. 

"Show me your walk, " Mr Yun's voice boomed in the room. As she began walking, he barked. "This is what I taught you? You walk as if you are walking towards the palace of an emperor. It's a beauty pageant not a concubine selection show!"

See, that is why she said he was cruelly perfectionist. 

"Start walking again, " He ordered and he began. But she was cut off mercilessly once again.