I was not born a bad person, but because of all the hardship I had in my life I discovered how sweet revenge feels.
There comes a time when it's too much and you can't take it anymore.
And you dream year after year of undoing the injustice that has been done upon you.
And when the moment comes, it's delicious.
They can see your eyes being cold, but you feel your own heart burning like hot embers.
Sweet revenge is doing positive for your own without intending bad unto others. Like you studied all your college life and have a good position in a company then have your bully classmate go under your supervision. Doing something for the sake of hurting someone will just give you satisfaction for a while. Do it for your own good and you'll be happy for a lifetime.