Killua is your Enemy. You guys hate eachother very much. But then the government came up with a system that everyone will have a heart mark on the back of their hand.

Their three colours to fill in the heart, one is white which means that a person is not in love with you, second is red which means someone is in love with you and lastly is black which means the person who's love for you is dead. You were really confused with how it works at first but you got used to it slowly.

It was the first lesson of the day and your walking to class.