A young man who tragically died in an accident finds himself reborn as a baby in another world! He is discovered by none other than the national hero and wise sage, Merlin Wolford, who takes him in and names him Shin. Raised as Merlin’s grandson, Shin eagerly absorbs his grandfather’s teachings—growing into an extraordinary magician with truly astonishing power. However, on Shin’s 15th birthday, Merlin suddenly realizes something crucial: “I forgot to teach him common sense.” And so begins Shin’s hilarious and overpowered journey into a world where his lack of common sense may cause just as much trouble as his overwhelming strength!