The Man of Kunkankan

One day Kim Dujo (20) . got isekai-ed & woke up in another world in the middle of the desert ..Soon he was carrying stones like other slaves on his back in order to build the pyramid ..When other gets isekai they gain mysterious abilities & gets harem but poor Kim Dujo turned into a slave working his ass off for half an year.One day Emperor Kun Khan, who was visiting the site when his pyramid was completed saw him & his situation changed