Levi's long lost twin™

Luke Rivaille is the twin brother of Levi Ackerman. They were both separated after an accident. Levi lives with his cousin, Mikasa Ackerman. Meanwhile, Luke is living with his new rich parents. For so many years, they haven't seen each other. They even forgot they were brothers. At the last day of their high school, they finally met.

To know more, read the book.