Ok theory time; I think these memories are from Dietrich's past life. I think Charlotte was the lady, and that she has been cursed to stay trapped in the mansion by her Step brother, who is oddly obsessed with her. In order to stop herself from getting married, I'd bet she kissed step bro at her debutante to convince him not to let her get married to the old guy who was 20 yrs her senior, since as she said he was given the family's powers. (Ofc I still don't know the timeline of stuff that happened, but I know by that point her step bro was named heir and that he was the one who ruined the painter's life since Charlotte had a crush on him.) Then she met Dietrich in his past life and fell in love with him.
(Here's where I'm getting into no evidence land) I'm guessing the step bro finds out they're courting and becomes outraged (cause he is obsessed) and forces Charlotte to become a maid for the household after her father dies and he takes over the title. Then, because Dietrich and Charlotte don't give up their relationship, Step brother finds a way to curse Charlotte to stay in the mansion, undying and unable to leave, and kills Dietrich for trying to save her (I mean he already tried doing that again on the second floor, there's no way he hasn't killed Dietrich before for being to close to Charlotte if they were involved in Dietrich's past life.)
I also wonder if Dietrich is so impacted by killing because he remembers the killing he did in his past life as a knight, subconsciously. It would be like double the trauma :'(
Though in this chapter it does say she's married, so maybe she did get married to the old guy? (But the TL has been a little confusing so idk if it meant she already is married or that she decided to get married to anyone to escape her family.
(Here's where I'm getting into no evidence land) I'm guessing the step bro finds out they're courting and becomes outraged (cause he is obsessed) and forces Charlotte to become a maid for the household after her father dies and he takes over the title. Then, because Dietrich and Charlotte don't give up their relationship, Step brother finds a way to curse Charlotte to stay in the mansion, undying and unable to leave, and kills Dietrich for trying to save her (I mean he already tried doing that again on the second floor, there's no way he hasn't killed Dietrich before for being to close to Charlotte if they were involved in Dietrich's past life.)
I also wonder if Dietrich is so impacted by killing because he remembers the killing he did in his past life as a knight, subconsciously. It would be like double the trauma :'(
Though in this chapter it does say she's married, so maybe she did get married to the old guy? (But the TL has been a little confusing so idk if it meant she already is married or that she decided to get married to anyone to escape her family.
