"Have you ever had that feeling before?
When you hear a certain song, you'll feel like that song is like a time machine. You'll unconsciously go back to certain moments in the past while following the melody.
Maybe it's a smile that was left in your heart unknowingly. Or maybe someone who slips into your dreams unconsciously. Or maybe it was a hug you remember very clearly accidentally.
Just like this song. It reminds me of a person that has been living in my heart since a long time ago."