I Accidentally Killed Someone and Pretended to Be a Nobleman with Loli.

One second, Li Yuan was still in the toilet, bald because of a stuck mathematics paper. The next second, the world was spinning, running naked across the country, falling from the sky, and smashing the empire's down-and-out viscount to death! The beginning is a dead end! The Viscount is dead, the silver-haired lolita assassin Liliana who was his personal guard will be hanged, three generations of the family will be demoted to slavery, and he, the "murderer", will die! In a desperate situation, Li Yuan and Liliana reached a cooperation: he took over the identity of viscount and went to a remote college to be a magic lecturer, and she served as a guard. The two were bound to survive! Everyone laughs at him as a dandy loser who was exiled from the royal capital. He can't even cast a fire spell, but no one knows that he has completely subverted the magic of this world with analytic geometry! Does traditional magic rely on talent? He relies on formulas! When others cast a spell, they have to chant to accumulate power, but he counts and casts it instantly! The magic power consumption is only a quarter of the traditional one, but the power is ten times higher! Everyone looked down on Liliana's Assassin class, saying that third-level assassins were not worthy of being teachers and taught things that were not practical, but he accompanied her and taught the Assassin class to a point that was feared by the whole hospital! Common girls whose talents are denied, and marginalized students who have been abandoned by the academy, can all find their own path with them! Do nobles use blood to monopolize power, use talent to define strength, and use rules to lock the way out for common people? Li Yuan looked at the world in front of him, ran his fingertips across the draft paper filled with formulas, and smiled faintly. Since the old rules are unfair, then I will redefine the world! (The author takes advice)