They were together in high school. When they were 18 years old, 0 disappeared. Then 1 became a policeman in order to find 0. One day a trainee policeman came and he found out that it was 0, but 0 had lost his memory. But 1 didn't know that he had lost his memory, so he thought he was pretending. Later he found out that 0 had lost his memory, and helped him recover his memory, and they became together later.
Purpose: Inspirational