Retribution Online

Daniel, a Korean youth constantly bullied at school and abused at home, obtains a game-like system called "Genesis" that gives him quests and rewards to improve his abilities. After a final beating at the hands of Jae-Hwan and his gang, the system activates. Upon completing his first quest by running 5 kilometers, Daniel discovers "Iron Fist Gym" and meets Mr. Han, a tough old trainer who agrees to train him. Daniel's journey of revenge and self-transformation has just begun.