The point in time when the female protagonist was possessed around the beginning it was fo...

The point in time when the female protagonist was possessed around the beginning it was for the subjugation of the demon lord. The reason for the possession at that time was because the original female protagonist did not want to subdue the demon lord, so she transferred her soul using gold magic. The reason why the female protagonist collapsed after the subjugation of the demon lord was probably because the original female protagonist wanted to regain her body. She tried and failed? As a side effect, the female lead collapsed, and the reason why her male leads turned around is because the original female lead approached her and made her fall in love with her by feeding her tea or food that could brainwash her.