I don't really read gl but I wish this take a gl route because the male leads are so creep...

Spoiler
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Sibel is ML. I LOVE Lycan for her as well but Mari told Sibel something very important that's related to her original life and he believed her (despite it being against the actual Marilyn) with no doubts and it felt like it was something really important bc duh she's still not the real Mari and what he told Sibel was proof that she existed (her past life). That's an ML flag right there.

what she told Sibel*

I forgot. Sibel is blue haired boy right?

Spoiler alert

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Her real birthday from past life not as marilyn (づ￣ ³￣)づ because her real birthday before isekai is the day after lara's birthday