Veritas (Official Colored)

Gangryong is a high schooler unlike others. He has always had a dream of being the strongest. One day he meets Youcheon, who teaches him a powerful skill. One year later, people come to see him and announce that his "master" is dead. Because he was his only student, Gangryong has to follow them and go to a school where everybody has supernatural powers to fight.

This is the webtoon, colorized version of the title, which was originally published in black and white in the physical magazine Booking.