Hunter Academy's Strongest Battle God

With an F-rank Trait, deemed the worst of the worst, 5-year-old Shin Yu-sung is abandoned by the Shin-oh family, which is famous for raising hunters. The same year, he meets the Fist King, one of the strongest hunters, at an orphanage and is adopted by him. The Fist King became the strongest not through his Trait or special abilities, but by training his body. He takes note of Shin Yu-sung's physique instead of his Trait—nine blocked yin pathways. Recognising the boy's potential, he trains him for 12 years, after which Shin Yu-sung enters Gaon Academy, a prestigious hunter training institution. (Source: Manhwaclan)