Artistic conception for survival

This is a story of twin sisters redeeming themselves through telepathy. My sister fell into a deep coma due to an accident, but her consciousness woke up in another unfamiliar place. My younger sister is guarding my sister's hospital bedPreviously, I could see the message my sister sent from that 'Beijing Villa'. After some exploration, the older sister's consciousness found some useful clues in the 'Beijing Villa', and the younger sister conveyed them through theseThe clues that came gradually revealed that this place was constructed by a mysterious person. What is the relationship between the mysterious person and his sister? Why does such a 'Beijing Villa' exist? How should Sister escape from Ascension？