The FL, who created the world the manhwa is set in (in a book), tells the ML the truth in chapter 91 (the whole truth)
Somewhere after chapter 100, the ML found out everything
Chapter 68: Daphne decides to tell her husband and her father-in-law about her previous lives and the current situation (I especially liked that she didn't just tell her love interest, but also her father-in-law, who she's is close to).
Chapter 84: it is made clear (she's talking to them in a way that implies that they were already queued in on the subject) that at least 2 of their vassals also know about the situation. I don't know whether they know about her original life or not, though
Ellin tells Kiha everything eventually
He finds out the truth in chapter 55
Messages