Spoiler:
Luca is like this with is uncle because in his first life when the uncle died, he said that he didn’t love him and protected him only because it was his duty. So he don’t really care about Luca.
Luca lived twice when the MC lived three times. The novel that MC read in her second life was her first life from Luca’s point of view, so some of the story is different from reality, like why MC didn’t like him in the first life. In reality mc really loved her sister, but she died because of Luca and he didn’t even look like her death sister, but look like his dad. But MC helped Luca and tried to protect him so she doesn’t really hate him.
OH that makes so much sense!! Thanks (⌒▽⌒)
*READ WITH CAUTION*
THERE MAY OR MAY NOT BE SPOILERS
LOL OKAY ANYWAY
So I read the novel a while ago and now that I'm reading the manhwa I realized that Luca is saying stuff like "I already saw it before" and " You weren't acting like this before" as if he had already lived this. (He's also incredibly unamused by everything) Also he says stuff like " I only brought you so you wouldn't do anything weird" cuz his aunt is a minor obstacle and was greedy to the point of doing anything to obtain more money and that had affected him. Also while reading the novel I realized how incredibly blind I am to notice small details like these ╥﹏╥
I'm still wondering why Luca is so bitter towards his uncle. Something probably happened in the past life.
If you want to read the novel I don't think you can. I'm pretty sure the group that was translating it dropped the project cuz the author noticed this and asked them to stop translating. So the group deleted this off of their site sadly