Chapter A-01 B-21 [Lost Bird]

After Robin went missing, everyone's been looking. He just broke down in front of the Young Justice one day and left, After 2 years they finally gave up. But their was a new assassin in town names Renegade. Ruthless but tactical killer. But what if Renegade is Robin? What happened to him those 6 years while he was missing and living a double life?