Comment by Terminalnavy on The World Without My Sister Who Everyone Loved - Chapter 4

All of them will regain their memories about the previous timeline. And boy oh boy do they feel remorseful about everything. The Geand Duke especially. He respected Sienna's wish until his death to keep his distance as she still wants to recover mentally from all of that stress and PTSD from the previous timeline.

Iirc, it was bcs they feel somehow fond and sort of remorse towards Sienna which they don't understand bcs they don't know her in this life. Those feelings stemmed from their feelings from their past lives. They genuinely liked Sienna but that btch did smthng like black magic (forgot the terms they used here) on the whole mansion which affected everyone tied to it like the nacht family and the effect was especially strong on Aciel who is directly tied with the house (it'll be explained in the future),and the magic is about the more you like Sienna, the more intense your hatred or negative feelings toward her will be, that's why Aciel was the one who mistreated her the most in her previous life because he loved her the most. We will also get a sneak of their past lives specifically, after Sienna died. Aciel went crazy and turned back time.

If she still sees the duke even though she asks him to keep a distance and what about her relationship with all the brothers

Yes, she still sees him and the brothers. The duke is her sponsor but they didn't become like a little happy family or what. The Duke simply respected Sienna's wishes of maintaining their relationship that way, Sienna is at least civil with him, then Michael became like her bestfriend, he's the closest to her among the Nacht family. And there wasn't that much improvement with her relationship with Aciel at first, partly because Aciel is away, at the academy, but years passed, they closed the gap partly because they need each other, they need to be by each other's side or have close contact (physical) to not feel pain because Sienna became Aciel's heart and he became her time axis (or smthng), this is because Aciel turned back time in exchange for his heart in their past life. Without Sienna, Aciel doesn't have a heart so he will be in an excruciating pain, the same happens to Sienna because she'll cease to exist without Aciel who became her time axis, because Sienna is supposed to be dead.

Yes, she still sees him and the brothers. The duke is her sponsor but they didn't become like a little happy family or what. The Duke simply respected Sienna's wishes of maintaining their relationship that way, Sienna is at least civil with him, then Michael became like her bestfriend, he's the closest to her among the Nacht family. And there wasn't that much improvement with her relationship with Aciel at first, partly because Aciel is away, at the academy, but years passed, they closed the gap partly because they need each other, they need to be by each other's side or have close contact (physical) to not feel pain because Sienna became Aciel's heart and he became her time axis (or smthng), this is because Aciel turned back time in exchange for his heart in their past life. Without Sienna, Aciel doesn't have a heart so he will be in an excruciating pain, the same happens to Sienna because she'll cease to exist without Aciel who became her time axis, because Sienna is supposed to be dead.