Originally, when they found out that Su Yang's strength was at the Supreme-level, Qiao Lu and the rest were already shocked.
And what happened?
Now, they learned from Yu Fuxue that Su Yang's strength was above the Supreme-level!
How could Qiao Lu and the rest not know that since Su Yang's strength was above the Supreme-level, it meant that Su Yang's strength was above lv.70?
One had to know that from lv.10 to 19, they were called kings.
Levels 20 - 29 were called Heaven Grade.
Levels 30 - 39 were called Emperor-level.
Levels 40 - 49 were called Transcendent-level.
However, from lv.50 to lv.59, they were called Celestials.
What about Supreme? They were between lv.60 and lv.69.
Above Supreme, it was definitely someone at least lv.70.
Correspondingly, the Emperor-level was the strength level of a 6-star Otherworld Instance Dungeon.