So, This has been on my mind for few days this is possibly either manga or anime as I don't usually read novel which have such dialouges It goes along as follows that a boy seeks revenge(??? Or not) against people who did something bad to his sister or girlfriend(like kill or make dissappear) but in process he found out that his girlfriend or sister has also done something evil or harm to many peoples so they retaliated. At the end he say qouted along these line :- I will forgive you so that his girlfiend or sister will be forgiven by people who was harmed by his sister/girlfriend. I think it was famous anime or manga and I remember only this bit. Thanks Edit:-It may also be kdrama or but chances are very low.