I belive that Garnet the red head is the Crown prince, since he is aware of what happened 20ys ago in the first jewellery box and that could be possible if his parents had taken part in it (the emperor and empress)
Also he seems to have good reflexes and swordsmaship (typical CP style).
Other reasons why i came to this conclusion are the fact that he sems to like the purple girl and she gives of the sweet Mary Sue FL vibe while he gives off the kindness and coolheadednes of a ML (im aware they're not the MCs but in the typical i got reincarnated in a novel trope they would be the MCs of the original story)
This might be a strech but i could be right. What do you all think? (=・ω・=)
BIG SPOOILERRR and i mean BiG(/TДT)/ (⊙…⊙ )
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About who the black haired man is ╥﹏╥ (probably)
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Im not sure what happens in the story but I read somewere that hes the male lead who turned dark after regressing and not being able to meet the FL in any of the regressions.
You can also confirm this if you look up the novels art that the author did, the ones with the man in the coffin and FL looking at him (there are 2 of them one whith black ML and one with white ML BOTH dead and in a coffin)
**Search this and go to IMG 빙의자를 위한 특혜**
And theres also another drawing where white ML and FL are in front of a white gate that looks like heaven and another one exactly the same but they both have black hair and are dressed all black in front of a black gate that looks like hell.
P.S White ML and Black ML are the same person (most likely) ╥﹏╥
Ahhhhh i can't, my heart can't take all this sweetness(* >ω<). They are so lovely (*´▽`*)