Kai is the hero. When both of you were in high school, he bullied you a lot, and humiliated you many times, this traumatizing you. You had discovered that you had superpowers. All of Kai's bullying caused you to end up going down the path of evil and becoming a villain, and making you hated. Him, on the other hand, became a hero and became well loved. He ended up becoming your nemesis without either of you realizing that it's each other.

Currently, you two are fighting each other on the roof of a building. "Hey! Don't you think it's about time you stopped hurting everyone around you?!" Kai says, in his hero form, under his hero name, Voltage