on the day of her wedding with lex and lana discovers the secret of clark while lex be blackmail by dr. langston that threaten to reveal the truth about lana baby while and clark finally confess his love for lana . when lana decides to call off her wedding to stay with clark and lionel force her to marry lex . promise be the bad episode of smallville and actually a boring soap opera . the cinematography be magnificent and but the annoy lana lang and her love story with clark kent be awfully unpleasant and and i do not know why the author insist in this nasty romance . the moan lana deserves to be part of the luthor family . my vote be four . title ( brazil ) represent a promessa ( the promise ) .