Arknights, But All Characters are Npcs?

[Day 1: I, Lu Shang, male, 24 years old, am a time traveler.] [Good news, I've traveled to Arknights.] [Bad news, everyone except me is just an NPC.] [Everyone only mechanically repeats the same sentence, doing the same thing every day.] [I suspect they're playing me.] [So I went to find the all-knowing Kal'tsit.] [Day 2: Kal'tsit is very smooth.] [It's confirmed, they are indeed all NPCs, not playing me.] [So what should I do next?] [Am I the only living person in the world? Will I die alone?] [Day 4: Angelica unexpectedly looks thin in her clothes.] [Day 5: Cintrea is really plain.] [Day 6: Lu Shang, Lu Shang, how could you be so depraved?] [Day 7: Skadi warms people's hearts.] [... ...] [Day 30: Wait, Kal'tsit seems to be alive?]