Identical halfsisters

Two identical halfsisters spend their whole childhood believing that they are twins. As teens, they promise each other that they will be taken by one man to always remain together. Things take a turn when their mother dies as she tells them the truth but not the whole truth. They grow apart and their bond is broken. They move and meet their royal family for the first time. Both sisters admire one king but he chooses one. Princess breaks her promises and Sofia goes crazy. She kidnaps Princess and lives her life but the king finds out and dies. The doors open and Sofia is elected to step in as the new leader but Princess escapes and does everything to protect the throne. Who will wear the crown?