Second Chance of Happiness

When There is a chance for Atone the past and Have another way to get happiness they deserves, Would it end up with Everlasting Happiness? or Just End Up in Another Tragedy? SeiSub,FuuKam and Kakyou/Hokuto. Rated T for Some Pairings that you all know and Drama :) Well... I know it should be in X Category but I can't help it !