Man, Crystal's journey is such a weirdly compelling part of Lookism for me. She starts off as basically this perfect idol, all icy elegance and untouchable beauty. But the show isn't really about her being perfect; it's about the slow, painful cracks in that facade.
What gets me is how her development is tied to realizing her own 'lookism.' She's been a victim of it, obviously, but she's also totally guilty of it. Watching her grapple with that hypocrisy, especially through her interactions with Daniel and the ugly truths about her family, is where she grows. It's less about becoming 'nicer' and more about becoming aware, which is way more interesting.
Her relationship with her dad is the real key. The more we see of that gilded cage she lives in, the more her initial coldness makes sense. Her development feels like someone slowly taking off a suit of armor, piece by piece, and realizing how much it weighed and how vulnerable she is underneath. The moments where she lets her guard down, like when she's genuinely worried or admits she was wrong, hit way harder because of the wall she built.