The Marquis's Family Magical Genius

"To stay alive… I have no choice but to become a genius. From today, I’ll do my best, so please support me."
Lee Hyun-woo finds himself possessing Kyle Seltarion, an extra character from a game where he used to reign as the world’s number one player.
Considering the game’s storyline, he soon faces the imminent death of Kyle, who, on top of being on death's door, can't use magic or aura and has a terrible reputation. How did he end up in the body of such a character?
However, after discovering a new talent, he learns to harness mana and begins to shift his attributes and reputation with knowledge of hidden routes gained through grinding in the game.
His immediate goal is to save his own life, but that goal is closely linked to the impending global catastrophe...
To overcome this situation, he needs to gather allies and boost his reputation! It's time to turn his past, which was a reckless mess, around and move into a new phase!