If you want the context, you can check out my post at the link below:
https://www.mangago.zone/home/mangatopic/20388751/
Be warned it’s a SPOILER but the answer will never appear in the main story. The full context is in the epilogue which I believe the manhwa will not cover.
About the first timeline, it is straight angst through near the end. It was a tragic life and the deeply saddening thing about it is neither Carcel nor Ines did anything wrong to anyone but this person took upon themselves to destroy Carcel and Ines’s life. The couple was completely innocent. They were engaged from a young age so they were rightfully each other’s partner. They were faithful to each other from childhood so there wasn’t another person who should’ve interfered.

That was an intense start to the chapter. Everytime new dialogue from the first timeline between Carcel and Ines is revealed, it feels like Ines was pretty horrible towards him while he just took it probably cause he’s the more laidback than her.
But also we don’t have full context, so maybe it’ll make sense when we do. I’m not sure.