In the Academy, there was the back of the mountain, and behind the mountain, there was a cliff.
Everyone in the back of the mountain, expect Ning Que, had been to the cliff and was surprised by the impressive view. It was so brilliant that they didn't often go there. For them, that cliff was not a dangerous place, but they knew very well that enjoying the view of the cliff and retreating at the cliff are totally different.
The last person in the Academy who was confined at the Back Cliff was a famous person, so much that no one outside the Academy was willing to mention his name, and they didn't dare to do that either. He was Youngest Uncle.
Everyone knew the story of Youngest Uncle retreating at the Back Cliff. And they also knew how hard it was to break the confinement there; it required the highest talent and greatest perseverance. Thus, it was really a shock to everyone when the master said he would send their Youngest Brother to the Back Cliff.