Yes, so from spoilers we know that Oscar remembers his past lives. Not only that, he remembers Ines's (technically everyone's) ACTUAL first life. In which Ines married Carcel but never returned his feelings (Carcel's) and essentially was toxic to him their entire marriage. In that life, Oscar lead a life of complete debauchery from the start, which lead to a rebellion and him getting killed by Lucien. Hence why he chooses to marry Ines in the second life, as a way of getting revenge, but he ends up actually developing some sort of feelings for her along the way, and it's only towards the end of their marriage (like 2 years before Ines ends herself) that he goes back to his debauchery lifestyle. I'm not sure what are his feelings for Ines in this timeliness, but I know he wasn't completely okay with how his actions pushed Ines to do what she did in the timeliness they were married.
Clarification:
Ines loved Carcel in the first life. Not sure what spoilers said she didn’t. She gave him an awful time because of certain reasons but no woman who doesn’t love a man would spend many hours on her knees praying to God to protect him while on the battlefield at war while she’s sick like a dog and dying from terminal illness. In fact, during this current timeline, Ines will attend a funeral and she will remember how in the first TL she dragged her sick body to the funeral just to see Carcel one last time.
Excerpt of Ines remembering the first TL:
Inés realized in deep fear that she could lose him in every way possible in the world.
On that selfish day, how much she loved him in the fear of the remaining days of her life. (When she thought her death was approaching in the first TL and went to the funeral just to see Carcel one last time)
Because she loved, how afraid she was of the days that couldn't be turned back. And she was still as afraid as she loved. Afraid to lose him. Afraid she hadn't lost him yet.
Oh I loved how Ines reacted when she saw Carcel In front of everyone too!
But now that it seems Carcel is remembering his past life, is it possible that the prince remembers his as well? Why is he so persistent with Ines when she has tried to avoid him all this time