Klay Randolph is a second-rate fighter who once entered the spotlight of the UFC, the greatest martial arts stage in the world. Now fighting to meet his ends, he remained in the underground scene of London.Until one fateful night, fate came back to bring the man down. An up-and-coming talented young phenom appeared to take him on. Outclassed, desperate and sluggish, Klay attempted to fend off this "kid", only to be battered down in the ground and pounded.  With no referee to step in and stop the fight in an illegal fighting scene, Klay, unconscious could not call to stop the fight, but his foe desperately kept massacring his opponent in a blind rage. And there he met his unavoidable demise.His life, kids and family flashed through his very own eyes, but there wasn't a thing he could do. After a few moments, he could feel his blood boiling, his vision growing brighter and brighter until he woke up in the body of his 16-year-old self. What will Klay do now with new god-given opportunities?