The BTS Wings album is full of references to literature and art. Using imagery from Demian by Herman Hesse, BTS explores the loss of innocence, and ties these themes to the characters in their existing fictional universe. Here is a guide to some of the most important symbolism.
Credit to R e v e r i e for this “Spirit” version of Blood Sweat Tears, go visit their channel and give them love: https://www.youtube.com/watch?v=t2ObshnWPYw