I know for a time people were doing TikTok's using a the lyrics that are roughly written on this Rough WIP and I had to find the actual full tune and fell in love with the music from the musical Dear Evan Hansen that'll be a full length movie later this year. And this son just speaks to me about the Warrior, Shadowsight from The Broken Code arc of Warriors.

He is born with many problems that are taken as a sign that he can be a Medicine Cat for Shadow Clan once Tigerheart and Dovewing come back following the happenings of Visions of Shadows and as time goes on he finds himself hearing what he thinks is Star Clan talking to him about how to help Bramblestar when he mysteriously falls deathly ill. When he seems to help him, only to find it was a failure to then lead to a reincarnation of a fallen Thunderclan Warrior over taken the former Bramblestar. And with all that follows afterwards starts to fall on this young cat into thinking maybe he wasn't as special as he thought.

Hence the words used in the background and the metaphorical wall between his former, happier self before all the Imposter!Bramblestar stuff.
He thought he was helping the Clans only to find and feel he's not as special as he seems. Closing off his emotions and falling into a sense of anxiety and deep depression of all the drama and hurt he had brought to the Clans. Even to the point of them calling for his head, even his own Clanmates, for all that has happened.

I may have read too far into the character but if you've read this arc and know of the character and the Hell he's gone through, then you can probably say this song is his theme song.

Tune: Waving Through A WIndow
Musical: Dear Evan Hansen

This is something to go with what I mentioned in the description of the previous piece of something I'm working on.
Had to get sketched out before I forget about it and scrap it.

The mirrored cats on the left side of the wall, the body is referenced from a short hair cat to get down the body since I suck at animal anatomy XD