Genius Grandson of the Loan Shark King

For thirty years, Mu-Hyeok Kim carried out the grim tasks of his family's brutal loan-sharking empire, serving as the right hand of his grandfather, the infamous "Loan Shark King." His reward for decades of loyalty was betrayal—execution ordered by his own uncle. Yet death proves not to be the end. Mu-Hyeok awakens mysteriously in the year 1990, reborn as a first-year high school student. Armed with foreknowledge, he arrives just in time to prevent his paternal grandmother's fatal heart attack. But saving her life comes at a cost, and with mounting hospital bills, he turns to his mother's side of the family. Determined to win the favor of the Loan Shark King once more, Mu-Hyeok plays the devoted grandson—but this time, his true goal is not acceptance. It is to seize the old man's fortune and exact bloody vengeance on those who wronged him.