The voice was familiar but I kept searching through all the 5 OST songs already released but I never discovered this song. I finally discovered by looking at the ending credits for episode 7. I saw Janet Suhh and it clicked. Sadly, the full song is not available yet, similar to the intro but it was worth it
I still listen to In Silence by Janet Suhh almost everyday so I felt a connection with the voice.
If you prefer the version with lyrics: