After Coma, My Mother Became My Grandmother

I woke up in a pool of blood, with a dead old man lying next to me. When I opened my eyes again, my father was gone, and my mother became "grandma", calling me "good girl" and saying that she was a time traveler. I didn't believe it. I stopped taking the medicine secretly, but my memory became crazier and crazier—— Did I kill someone? Am I a time traveler? Am I a boy or a girl? When I was ten years old, she forced me to have a secret marriage with a paper man. When I was twenty years old, I saw an unshaven man in the mirror. She gave me medicine for twenty years and asked me to be her "granddaughter". From the cellar came her cry, her father's laughter, and her grandfather's heartbeat. The door opens, should I walk or jump?