Personality and Soul

My name is Lin, and there are several strange guys in my body, but they told me that they are me, but not me, I am them but not them, do I have schizophrenia or are they separate individuals? Why are there people like them in another world? Why is the world I am in closely related to me? What is the purpose of fighting these guys who look like me? How do I introduce the characters: Lin: My real name is Li Lin. I don't like being called by my last name because I don't get along with my father. I'm 20 years old. I'm thin and cold on the outside but hot on the inside. I can only let go in front of acquaintances. I look good but a bit spooky. I live in world number 2. Who is the guy I see in the mirror... Lin Yu: 18 years old, world number 3, was taken away by the hexagonal prism and a trace of his soul was left in Li Lin's body. He is a rich second generation, with acceptable strength and a good person. During the battle with the Hesheng Organization, he was thrown into the world wall and met Li Lin. He is 173cm tall and looks brighter. The same face has a different aura. He likes to do his own styling. Lin Bi: 20. No. 4 This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.