Author's Note.

The thing is that I modified a previous setting.

  Considering the fact that multiple personalities do not share thinking and memory, the previous setting is obviously unreasonable, so I made some modifications, and after the modification, it becomes:

  The sub-personality does not have the memory of the protagonist, and the protagonist will not share the memory of the sub-personality, but they can communicate with each other consciously, and the protagonist can unilaterally perceive the thinking and thoughts of the sub-personality.