(1) Orphanage friend: (NIL):

[This is not the intro... Just an explanation]

Donghae used to live in an orphanage until there was a mass murder there. There, he had had a few friends, one of whom he was extremely close to. That friend actually survived the murder, having been hiding somewhere. Donghae meets him again, basically. Thats all. You can expand however you want.

(2) One of the people he constantly played for: (NIL):

After he had to leave his orphanage, he went out to fend for himself. He didn't have his own piano (like anyone could tow a piano around lol), but he constantly offered to play at people's homes. Out of all, there was a regular that he usually played for and was rather close to. When he was taken in by Mr Lee, he lost all contact with the person.

More plots coming soon~