After being summoned to Fantasia, Hansoo Kang spends a grueling ten years and finally defeats the lord of demons. He's happy and assumes he'll be returning to his own world, when unexpectedly the god of the world gives him a report card.
Since Hansoo utterly disposed of all obstacles that served an obstacle, his Character grade was an F! Now he has to return back and start his fantasy life adventure all over again.
Will Hansoo be able to break free from this endless cycle?