Responses
The angels did it because he shouldn't have gone to the angels place and be judged by them. They made a mistake in their files and thought he was a bad person when in reality he was just really close to one (his dad). So they made him forget everything including everything about song because he was part of their mistake. Hope it helps!
Sorry guys but I wanted to know why the ml lost his memories? I haven't read this in a while and I'm slightly confused