I guess I was wrong. So he is the actual space around him not the air of that planet. The solution to create a black hole is the optimal solution. Although in this manhua they treat blackholes like they are wormholes that have an exit. An actual blackhole is a phenomenon in which gravity is so strong that it causes a distortion in space that causes all matter to be sucked in and compacted into a conglomerate of material that has an incalculable density. Only supergiant stars or larger have enough mass to create a black hole.
The teacher is becoming increasingly more mysterious. She is most likely an angel but, she also has some sort of ability to manipulate the mind and create illusions.