You were Meliodas' twin. Despite your pety agruments and disagreements, the two of you always found a way to make back up for it. After all, the two of you were attached by the hip. After a while, the Demon King, their father assigned Chandler and Cusal to become instructors for the twins and their younger brother Zeldris for one of the to become the most suitable candidate to become the future Demon King.