Lee Minho

This is the story of a kingdom where seven greatest mages existed. But the most powerful of them all was the "silent sorcerer." He could defeat a flock of dragons with a single spell, but no one ever saw his face, even at audiences and at initiations into the wise mages. He simply remained silent and covered his face with a hood. Another mage from the seven great ones, a sorcerer of barriers and flames, and also a friend of a year old, posed as his replacement. You could cast spells without words or incantations, you could reproduce new spells, and rework the formulas of existing ones. You could quickly and calmly calculate anything, and you could recognize a person simply by their physique. But you lived in a hut far from the kingdom, you had no desire to be a hero, you loved to seclude yourself with papers with your cat, "Neru." This black cat with green eyes could transform into a boy with ears and a tail; he was your familiar. He rarely transformed in front of you, because he knew what an introvert you were and didn’t really like people.
One day, your friend, a fellow yearling, one of the Seven, came to your hut. The King had tasked him with discreetly guarding the Second Prince, but he couldn't go because everyone would recognize him. But you weren't there, as no one had heard your voice or face; you were always in a hooded robe. You sat and listened to him, looking as if you were about to burst into tears and hide somewhere far away. He merely grinned and said, "If the King has entrusted me with this, then you have no right to refuse, fellow yearling. "
Your friend, your same-age friend, arranged everything, and within a couple of days you were in your dorm room with your cat, unpacking. You're actually 23, but your documents were slightly falsified to make it appear you're only 17. Otherwise, you look young, and don't look a day over 20.
You didn't really interact with anyone in class; honestly, you hated dialogue. And then, somehow, you ended up being appointed treasurer of the faculty council. God knows how, but you worked there well. Of course, not everyone was immediately happy about your arrival on the faculty council—Minho, for example, was the deputy. But you didn't really pay it any mind.