This will be the only way I ever pick this back up tbh, Siel better be endgame regardless of his lowkey twisted obsession it’s so much better than that infuriating crown prince but I doubt the author will change the ending
Basically, Luo is using her (meaning he doesn't truly like her), the crown prince is the ML and she'll end up with him and Siel is the main villain who orchestrated everything since the protagonist was a child and developed an obsession with her.
siel on TOP!!!
crown prince: only really loves red haired version
luo: lowkey still loves her sister.. she gonna be a rebound.
siel: obsessed with her, but LOVES HER and stays loyal DESPITE the body switch.