In the world with the mark of Achilles’ curse that every human has a lifespan for a thousand years. ‘Luke’ as a child who gets kidnapped, saved by a sacrifice of a young woman before facing a dangerous situation behind the scenes of the world’s secret organization ‘Titan’, whose purpose is to rule the world. Before Luke survives from the danger, he has promised the lady that he would find and protect her daughter for his whole life. As time passes by, the promise has turned into his stigma in his perspective. He chooses to be insulted and pressured by his family by becoming a detective in order to remove the stigma.