Suddenly remembered a piece of plot that I forgot the title of... All I remember is that MC got reborn to his teenage days. He went back to the time when he became a slave and forced to do fortune-telling for some wealthy people. MC was tortured bcs he punched the wealthy guy/refused to do fortune-telling (not quite sure) & got punished. If I remember correctly, ML has promising military talent(?) he is either a prince/son of a general. The story mentioned something about a tower.... probably where MC got punished/lived before