( 사채왕의 천재 손자 / Genius Grandson of the Loan Shark King / 闇金王の天才孫 / 貸金王的天才孫子 / Le Petit-Fils Génial du Roi de l'Usure / El Nieto Genio del Rey del Préstamo / Cucu Jenius sang Raja Rentenir )

Thirty years of absolute loyalty. Thirty years of doing the bloodiest, dirtiest work in the shadows for his family. And how was Mu-Hyeok Kim rewarded? With a knife in the back and a cold grave, ordered by his very own uncle. But fate is not finished with the rightful heir to the loan shark empire.

Waking up in 1990 as a high school freshman, Mu-Hyeok is given a golden second chance to rewrite his tragic destiny. Armed with three decades of future knowledge, ruthless street smarts, and an unquenchable thirst for vengeance, he is ready to flip the script. When his grandmother falls critically ill, he faces an urgent need for cash, forcing him to dive straight back into the lion's den. He will play the part of the devoted grandson to the monstrous Loan Shark King, climb the ranks of the family empire, and steal every single penny from under their noses.

If you love high-stakes financial wars, cold and calculating protagonists, and satisfying revenge plots where the underdog uses sheer intellect to dismantle a corrupt empire, this series is your next obsession. Prepare yourself for a thrilling psychological battle where family bonds mean nothing, and money is the ultimate weapon. Follow Mu-Hyeok as he turns the tables on his betrayers and claims the throne that should have been his.

manhwa drama, revenge manhwa, regression manhwa, genius protagonist, financial drama, betrayal, second chance, modern fantasy, crime drama, business manhwa