Review Detail of DryIcee in My Magical System

Ok so to start, this story is good, but the thing that annoys me is that it has been 100 chapters and nothing significant has happened except for him defeating the rat lord, fought some assassins, gone to the capital and gone to fight some perverted noble. What I want some to answer is does Yeman know its his classmates, crush and ex best friend who have been summoned because otherwise the (Yeman made a promise to himself, that the next time their path cross, he will teach them true despair.) line in the summary does not make sense.