Sorry it took me a while to spoil you guys, but here it is. *From tiktok*
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SPOILER:
Apparently, Nina (reincarnated one) is the original Nina. She doesn't remember that it's her past life originally. The King killed Nina in her past life because he needed the Saintess. But since Nina helped the Saintess escape, she got put into jail and was killed afterwards. Then they found out that Nina has the potential to be the next Saintess. (Usually when the Saintess dies, she gets replaced. But it is said that one of them will die, and that was the Saintess.) Now it's too late. No one saved Nina, because she's just an orphan so no one cared about her.
*Fast Forward.
They had a happy ending. The king is the ML. They got married, Nina became the Queen and the Saintess. The first Saintess lost her power and is said that she ended up with the Pope. They traveled all around the world.
Leo, actually loves Nina. He offered to adopt Nina to be his sister, but since Nina knows that Leo has feelings for her, she declined because she doesn't want to hurt him even more. It is also said that the Author made alternative endings for each male leads where Nina ends up with the other men who has feelings for her. But the original ML is the King.
I would like to add another SPOILER.
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In Nina's first life, the red haired guy ordered Nina to get executed, the King allowed it, and Leo was the one who killed Nina. The Pope agreed for Nina to get killed, and yes, Nina is the Pope's sister (He didn't know that time yet). Everyone just watched Nina die. EVERYONE.
Who wants a major spoiler?