The parents were losing their business money after their trusted person stole their account's money. And used it for his own life. Leaving the family businesses to bankrupt. So, in desperate, the person they dealt with was the richest young man. But the only way to save their business is to have their daughter Alicia marry that young man/woman.

*Liliana is the twin sister of Alicia. Alicia wanted to marry, but at the same time she was afraid and uncertain if someone she would marry, either is kind, loving, caring. Or if he/she is bad, abusive of power. So, Liliana who supports and understands her sister, takes the place of Alicia, while letting the latter escape and build her own life. What Liliana never knew that this path that was meant for Alicia would change her life forever. She can choose either path of immortality or remain a mortal, continue living her normal.

(Make your own character who will be that rich person. Either woman or man. Vampire, werewolf, sorcerer. You can be whatever you want. Use your persona, if you want. Good luck.)