People are in Star Iron; who says they're just NPCs?

[Day 1: My name is Lin Li, and I've transmigrated!][Good news! I've been transported to the world of Honkai Impact: Star Railway, specifically to the Black Tower Space Station.]Bad news! I think I've been transported into a game, and all these people are NPCs?![The next day, the little black doll was very smooth! And very realistic! The doll's joints are suitable for some uncommon poses, not bad!][On the third day, placing Estelle on her beloved telescope was indeed a good idea! Her legs are amazing!][On the fourth day, Kaffa is quite big, no wonder she's called "Kaffa's mom"! Well, I'm not talking about age, I don't know how old she is!][Day 5, Silver Wolf is so cute! Who would have thought that this genius girl likes teddy bear prints?][Day six, March 7th, was also adorable! And surprisingly interesting! Bringing your own camera? Then strike a few more poses for photos!][On the seventh day, who's older, Himeko or Kafka? They seem about the same age, though I'm not referring to age.]On the thirtieth day, Estella cried out, "Who are you?! Why are you in my room, and why are you touching my feet?!"