Looking for a manhwa that has an mc that hides his power, and goes to an academy where they go with instructors to level in dungeons . The mc hides his power and the instructor takes on his merits. The isructor knows that the mc is hiding is power and he was happy at first, then slowly he is not. The mc is powerful and knows how to use all types of weapons and martial arts. The academy he chose is a public one and another girl entered with him and she comes a famous powerful family. The mc also helps her and hides his power from her as well.

This? The Constellations Are My Disciples

Nope thats not the story. The instructor is a white/grey haired man with eye glasses. The mc is a reincarnated, he remembers the future events and tries to minimise them. The instructor was a famous person in the future. I am trying to remember the story. But my mind in jumbled up.

A returner's magic should be special?

Thnak you so much for the reply. This is not the manga also.