Mu thinks of the others who are distracting for him and the trouble of the person's efforts who gave him the keycode, sacrificing for his sake. There's something he needs to find out here and he wants to find out.

He steps off the elevator because he is curious and unafraid. Not a hospital? Then what is this room? He has a sinking feeling. The room has no windows or doors, which is odd by itself.

"Yeah, I took a wrong turn. But I'm curious too. What are you guys are up to? Can I stay for a while?"