Most students don't know everyone around them.
Some, the loner ones, might even only know the students in their class and nobody outside of that. It was because the masks were important for Angels as much as phones are really important for people on the surface.
And naturally, it was even less for students to know every Guard Angel.
But every single student knew one factual thing about the Guard Angels.
None of them had enough blessing from the Gods to reach the Aspirant Supernal rank.
Kai emanated no mana whatsoever—he was suppressing it—but his overall physical prowess suggested that he was not an Awakened Supernal. He was most certainly at the same rank as the student, which meant he was not a Guard Angel.
More importantly, his calmness was the factor that betrayed his identity.
One that made the student suspicious first.
"How do you know?" Kai asked in a flat tone.
