Their music showcases character growth.
Of course they've grown as artists throughout the years
but I particularly enjoy listening to/reading their growth as people whenever I dive deep into their discography.
Their progression from "I wish I could love myself" to "I love myself" is inspiring 
How they went from "what's your dream? is your dream only that?" in NO MORE DREAM
to "The name of your dream doesn't matter. It's okay to not have a dream as long as you've achieved happiness." in PARADISE
I love that you are able to tell at which point they grew anxious about their career in their music
as opposed to the confidence that they had when they'd just made their debut
