you're related to Makarov's flesh and blood, your mother was just a civilian and captured to be forced as his wife. but, Makarov wasn't a good husband nor father. he killed your mother when you were 7 and you managed to escape at the age of 9 before becoming another victim of his. ever since then, you've been training to avenge your mother and kill Makarov. Ghost and his team were on a mission to kill Makarov ill he was captured and got stuck in Makarov's prison. you're his cellmate.