His Manservant

Levi Ackerman is the Prince. He lived with his uncle, Kenny Ackerman who is also the current ruler of the country, after the death of his mother when he was a little kid. Mikasa Ackerman is the Princess and also a long distant cousin of Levi. Even though both Levi and Mikasa can be seen as brother and sister, however they are not getting along well at all. Eren was appointed as Levi's manservant and bodyguard by Kenny after he saved Levi's live during the grand ball at the castle. Little did he know that, Eren was hiding secret and had everything planned in other to be close with the prince.