What is the name of the song at the start of K: Return of Kings? Does anyone know the song title in K: Return of Kings episode 1, at the first scene where Scepter 4 and HOMRA meet on the rooftop of a building, from 00:06 to 03:20? 

I tried to google it but the result was only the opening and the ending of K.
The official audio is not yet released but someone made a piano cover in youtube. Here's the link:

https://youtu.be/cu7qN-_80w0