Doubao, Can We Really Become Immortals by Doing This?

My name is Huo Yu. I traveled through time... Did I really travel through time...? I died in the first month since time travel... Am I... Really dead? If the person who died was Huo Yu, then who am I? They said that the world was destroyed, and it was destroyed on the day I died. So who was the man in the white coat in front of me? Why does he have to remind me to take my medicine on time? Am I really just a figment of someone's imagination? If I am really fake... I must find him... And then... Don't get caught by me!