they suppose to be cousin . N"k is staying w/ the cousin cuz her family live out in the countryside and she came to study in the city . N"k is very loyal & obedience toward the family special the cousin even though she was treated like a servant in the house . Even though the n'k know it the cousin who cause the whole drama but she would still try to protect her and keep the secret from the P"K -- yeah i know topical N"k characteristic . When the P'k found out dat he kidnap the wrong girl in the old version the p'k cry LOL he was hurt & hate himself for being so stupid. So , he plot another way to revenge the cousin hahaha instead of kidnapping he court her and making her fall in love w/him and drop her like a hot potato by proposing to the N"K . Yeah , revenge is sweet.