
Someone told me the other person who had same mark is Zay herself. They said aseph doesn't had the mark but he is really the destiny man for Zay which Aseph mark also on Zay. It's just the seal of two of them is complicated to explained. The black man u said is the Prince who has the same mark with Zay sister. I still believe the previous spoiler said.

Hehe enjoy ヾ(☆▽☆)
https://newtoki67.com/webtoon/233928/악역의-구원자?toon=일반웹툰

Bro I read the raws and I think yoy confused Elzay with her sister, you stand corrected. The black haired THICC man had the same mark with Zay's sister, on the same location of their body...So no Elzay has not found her soulmate by mark, SHE HAS ONLY FOUND A BETTER MAN...Idk about the attacking black magic guys was idk how to read korean...I truly believe that Azeph is Elzay's soulmate, maybe the mark on Azeph is still not there because he's so full of hate and pain that he can't let go of from the past that God has still not forgiven him, instead giving him Elzay that can somehow save him and form a mark.
From what I've seen in the raws:
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. I don't understand the language so it's a supposition based on the drawings
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It seems that the ML of the original story (the black haired guy) is her soul mate. And, as it was said before the curse is stronger than the person's volition, there were a few scenes in which the fl blushes from seeing black haired guy. So yeah, as if aseph hasn't had enough drama.. fuck (╯°Д °)╯╧╧
Hope I'm wrong tho.. :(((